e34bc538c3 Add new type for sequence (Noah Lanson)
Pull request description:
#1082
Created a new type for txin sequence field with methods to create sequences with relative time locks from block height or time units.
ACKs for top commit:
Kixunil:
ACK e34bc538c3
tcharding:
ACK e34bc538c3
apoelstra:
ACK e34bc538c3
Tree-SHA512: 6605349d0312cc36ef9a4632f954e59265b3ba5cfd437aa88a37672fe479688aa4a3eff474902f8cc55848efe55caf3f09f321b3a62417842bfc3ec365c40688
f3b2120ec9 Create configuration conditional bench (Tobin C. Harding)
f60c92ca58 Add informative error message to DO_BENCH (Tobin C. Harding)
c6d5a12b60 Add cargo/rustc sanity calls (Tobin C. Harding)
34d5a3141d Put triple ticks on their own line (Tobin C. Harding)
Pull request description:
Currently we are unable to build with all features enabled with a non-nightly toolchain, this is because of the use of
`#![cfg_attr(all(test, feature = "unstable"), feature(test))]`
which causes the following error when building:
error[E0554]: `#![feature]` may not be used on the stable release channel
The "unstable" feature is used to guard bench mark modules, this is widely suggested online but there is a better way.
When running the bench marks use the following incantation:
`RUSTFLAGS='--cfg=bench' cargo bench`
This creates a configuration conditional "bench" that can be used to guard the bench mark modules.
```
#[cfg(bench)]
mod benches {
...
}
```
ACKs for top commit:
Kixunil:
ACK f3b2120ec9
apoelstra:
ACK f3b2120ec9
Tree-SHA512: 7ec2a501a30bfe2ce72601077cd675cf5e5ac2f0f93f97fc7e83cb7401606b69ae909b35bfc0ace8bd1ea771ca4fba70e2ad9ac9ba26f2b6e371494cf694c0a8
ef7fef001c Derive Hash on a bunch of types (Tobin C. Harding)
Pull request description:
In preparation for being able to derive `Hash` on all types in `miniscript`, derive `Hash` on all of the required types.
This PR includes all the changes in https://github.com/rust-bitcoin/rust-bitcoin/pull/933/files and hence supersedes it.
ref: https://github.com/rust-bitcoin/rust-miniscript/issues/226
ACKs for top commit:
Kixunil:
ACK ef7fef001c
apoelstra:
ACK ef7fef001c
Tree-SHA512: 1a1db8b4df2ea8f9e176434bb6fdee5b96f47dcdc6395ebc59e5f5ac5eb13a66fb61e1d90cdbbf12a027f7685fdff21060338c5f27b9d9bf5e9fee452c7c7e83
896ca42a53 Document PSBT roles and limitation (DanGould)
Pull request description:
The READEME claims rust-bitcoin supports PSBT finalization, but really needs rust-miniscript for that. I think we should make this clear in this crate's PSBT examples as well.
> > Understanding scripts and witnesses doesn't scream rust-miniscript to me. Miniscript crate is not the first place I'd look, since it's additional.
>
> We should probably add it to the README here or something. If I needed to deal with scripts or witnesses in any way beyond reserializing them or hashing scriptpubkeys into addresses, I'd immediately turn to Miniscript. You basically can't work on scripts without it, unless you are doing something very specific.
>
> >Anywhere there's PSBT code I expect a finalizer, even if it had documented limitations.
>
> Not to be too glib, but suppose we had a finalizer that just always returned an error, and was documented not to finalize any transactions. Would that meet your expectations? It is hard to do much more without Miniscript.
>
_Originally posted by apoelstra in https://github.com/rust-bitcoin/rust-bitcoin/issues/630#issuecomment-1175316689_
ACKs for top commit:
apoelstra:
ACK 896ca42a53
tcharding:
ACK 896ca42a53
Tree-SHA512: e71a65b8c04134d9b3406ea76bb915fa116e4a961f9f6cb24350422f9d550cba26a630e02f9ba352fae63076926532bc4bf2d1001488666a05f18d7774ddda9e
5ce34011f2 Implement std::error::Error for ParseAmount (Tobin C. Harding)
Pull request description:
The `ParseAmountError` does not implement `std::error::Error`, must have been missed when we did the rest.
Implement `std::error::Error` for `ParseAmount`.
ACKs for top commit:
Kixunil:
ACK 5ce34011f2
apoelstra:
ACK 5ce34011f2
Tree-SHA512: 8dafc472b7c23b54d856344e786e0f22e8e179f30f6c1011fbf5f8f0c6b1b5d74ed8e4f2638e5f8246f04dbb429e60027db6fe584d51a78957a6e904feb9e8a3
Currently we are unable to build with all features enabled with a
non-nightly toolchain, this is because of the use of
`#![cfg_attr(all(test, feature = "unstable"), feature(test))]`
which causes the following error when building:
error[E0554]: `#![feature]` may not be used on the stable release
channel
The "unstable" feature is used to guard bench mark modules, this is
widely suggested online but there is a better way.
When running the bench marks use the following incantation:
`RUSTFLAGS='--cfg=bench' cargo bench`
This creates a configuration conditional "bench" that can be used to
guard the bench mark modules.
#[cfg(bench)]
mod benches {
...
}
If CI script is run with `DO_BENCH=true` and `TOOLCHAIN` set to a
non-nightly toolchain the build will fail with a less than meaningful
error. To assist runners of the script output an informative error
message if an attempt is made at using the wrong toolchain.
1e46eeaa88 Upgrade to bitcoin_hashes v0.11.0 (Tobin C. Harding)
Pull request description:
We just released a new version of `bitcoin_hashes`, upgrade the dependency to v0.11.0
ACKs for top commit:
apoelstra:
ACK 1e46eeaa88
Kixunil:
ACK 1e46eeaa88
Tree-SHA512: 32173349c280c255681ebf15a1aa98a28b7016bb813ca907ac55a9797d9d17e1da344e2d8e74c02c2c80d2e6873a03f522c2d55b289b65d7ac55f402b19d689b
24f0441d54 Add PublicKey::to_sort_key method for use with sorting by key (junderw)
Pull request description:
Replaces #524
See previous PR for reasoning.
This solution is a little more straightforward. The name and documentation should be enough to prevent misuse.
We can also impl a to_sort_key for any CompressedKey added later. (or just impl Ord in a BIP67 compliant way)
TODO:
- [x] Add more sorting test vectors. Ideas of edge cases to test are welcome.
ACKs for top commit:
apoelstra:
ACK 24f0441d54
tcharding:
ACK 24f0441d54
Kixunil:
ACK 24f0441d54
Tree-SHA512: 92d68cccaf32e224dd7328edeb3481dd7dcefb2f9090b7381e135e897c21f79ade922815cc766c5adb7ba751b71b51a773d103af6ba13fc081e1f5bfb846b201
In markdown triple ticks go on a line of their own. This change does not
effect the rendering in GitHub which is managing to parse this section
correctly already.
35edcaa4ca Remove extern crate core statement (Tobin C. Harding)
Pull request description:
Now that we have an MSRV of 1.41.1 we no longer need `extern crate core`, remove it.
ACKs for top commit:
apoelstra:
ACK 35edcaa4ca
Kixunil:
ACK 35edcaa4ca
Tree-SHA512: 0efa0f05d3e9f797c493757fce6ca7703dd8439dbce4e9ff8113494fc71691ab4171c6f0fb5239b57ff5f0e223d48b057265a3df79898a399ca455040580aab2
36f29d4357 Upgrade to secp256k1 v0.23.0 (Tobin C. Harding)
Pull request description:
We recently released a new version of `rust-secp256k1`, upgrade to use it.
ACKs for top commit:
apoelstra:
ACK 36f29d4357
Kixunil:
ACK 36f29d4357
Tree-SHA512: 46a909dec8bc59daa78acdb76824d93f4f1da0e9736cf6ca443d3bbadfa43867e720293bb7c4919cb0658e75ec59daeffea080611f0e7eed4df439ddac0305de
19ba7ecc03 Add custom error for unknown address type parsing (Arturo Marquez)
Pull request description:
Adds a custom error `UnknownAddressType(_)` which is returned in cases where an unknown address type tries to be parsed via
`FromStr`. This provides more context for the error, since it contains the `String` that tried to be parsed.
Closes https://github.com/rust-bitcoin/rust-bitcoin/issues/1064
ACKs for top commit:
Kixunil:
ACK 19ba7ecc03
dunxen:
ACK 19ba7ec
tcharding:
ACK 19ba7ecc03
apoelstra:
ACK 19ba7ecc03
Tree-SHA512: 2f94eb2e122c1acafcb8c852f7bfe22cb3725806541ae40f82d3a882011fb911ce8fc430153ebea4066f43c5a51813359a4c9b95d2a9077ce8f6dcaa58eee6fd
91ff2f628c Introduce SPDX license identifiers (Tobin C. Harding)
Pull request description:
When `rust-bitcoin` was started in 2014 the SPDX license list and short identifiers where not a thing. Now that we have short identifiers and they are gaining popularity in other projects we can consider using them.
- Add links to the SPDX website in the readme
- Shorten the author section to a single line
- Remove all the licence information in each file and replace it with an
SPDX ID (see https://spdx.dev/ids/#how)
Of note:
- If the author of a file is explicitly listed, maintain this information
- If the 'author' is listed as the generic 'Rust Bitcoin developers' just remove the attribution, this is implicit. This does loose the date info but that can be seen at any time from the git index using
`git log --follow --format=%ad --date default <FILE> | tail -1`
apoelstra, please confirm that I'm not treading on your toes here, especially, are you ok with the new 'written by' string format?
### Ref
- https://spdx.dev/ids/#how
- https://spdx.org/licenses/CC0-1.0.html
- https://spdx.dev/ids/
ACKs for top commit:
apoelstra:
ACK 91ff2f628c
sanket1729:
ACK 91ff2f628c. I am also in IDGAF camp, but I like more red lines in diff.
Kixunil:
ACK 91ff2f628c
Tree-SHA512: ca8aac00f015c18ec18de83dfeb50dd6f4f840653c7def85daa2436a339021ada5f3c34ad0cdf6b18e3e39c45a6d58a8313742e4001d467785b10eee7fdbc938
Adds a custom error `UnknownAddressType(_)` which is returned in
cases where an unknown address type tries to be parsed via
`FromStr`. This provides more context for the error.
For more info see [1].
[1] - `https://github.com/rust-bitcoin/rust-bitcoin/issues/1064`
32cfd93933 Use to_hex when available (Tobin C. Harding)
Pull request description:
We have a bunch of calls to `format!("{:x}", foo)` for types that implement `ToHex`. The code is terser with no loss of clarity if we use the trait method and call `to_hex()`.
ACKs for top commit:
apoelstra:
ACK 32cfd93933
Kixunil:
ACK 32cfd93933
Tree-SHA512: 87cb6660708c11dfafb56bd6e2ea2634043b2226d51903a20806c1ba51c6e7c4f0e4cc25e49f820b5b1236600af7da2a20893c49a5b8845d7652b143fd0ec388
6adb2c64d9 Remove redundant compile_error (junderw)
Pull request description:
Same compile_error with more verbose explanation is also on line 66.
ACKs for top commit:
apoelstra:
ACK 6adb2c64d9
Kixunil:
ACK 6adb2c64d9
Tree-SHA512: e6ee9a0212e3babeb0e7235495295aa6893470db8308159c349784320f916216e17ab23285351ab19517baf0448a3b9d0beb88f0e31f66b8ee8d6ee4fbdda113
64152ff6fc Remove unused lifetimes (Tobin C. Harding)
Pull request description:
We somehow have two lifetimes that are unused and causing clippy warnings, remove them.
This fixes the red CI runs on a bunch of other open PRs. FTR I have no idea how these got past clippy onto master.
ACKs for top commit:
Kixunil:
ACK 64152ff6fc
apoelstra:
ACK 64152ff6fc
Tree-SHA512: cced838b575b29d90c4325ab42ada93bae4751721d3ca2c19ec801892c38130570613e4ab8de757b73ecc83cda5c00a32867139e04a2615833d05dc21551af1a
4d2291930b Use fragment-specifier literal (Tobin C. Harding)
Pull request description:
Currently we are using the fragment-specifier `expr` in a bunch of
macros for captures that are only used for literals. If we use `literal`
instead it allows the compiler to give slightly more specific error
messages.
The benefits of this change are minor. Of note, this patch found one
unusual macro call site (removed unnecessary `&`).
The macros changed are all internal macros, this is not a breaking change.
ACKs for top commit:
Kixunil:
ACK 4d2291930b
apoelstra:
ACK 4d2291930b
Tree-SHA512: 51c109fe3a884191bf623508555c1d5ad337a3f3b48538d18aec13e581f2c5fbbd055be49600ced19f38541412c34090bd8bac61fd05d5aa9702c96ff521364f
We have a bunch of calls to `format!("{:x}", foo)` for types that
implement `ToHex`. The code is terser with no loss of clarity if we use
the trait method and call `to_hex()`.
a8e62f249b Remove Uninhabited (Tobin C. Harding)
Pull request description:
Last release, before we had access to `non_exhaustive` we added some fancy types to enable conditionally having a `bitcoinconsensus::Error`.
Now that we have bumped the MSRV and have already added `non_exhaustive` to the `Error` type in question, we can use a compiler attribute to conditionally include the `bitcoinconsensus` error.
Remove `Uninhabited` and its usage.
For more context see the [original attempt ](https://github.com/rust-bitcoin/rust-bitcoin/pull/1025)at using `Infallible` (last comment in discussion thread).
ACKs for top commit:
Kixunil:
ACK a8e62f249b
dunxen:
ACK a8e62f2
apoelstra:
ACK a8e62f249b
Tree-SHA512: 8c03c44d7533af1a9a1185b7f9e0fa2c52369eaac8a45f0e2199e7e1bbd08ba2bfa23d829d2c2abf7f45fe8cc26ccad02f2e1a6d408d2c0fbca23140cafe3801
1fea098dfb Support unsized `R` and `W` in consensus encode/decode (Dawid Ciężarkiewicz)
a24a3b0194 Forward `consensus_decode` to `consensus_decode_from_finite_reader` (Dawid Ciężarkiewicz)
9c754ca4de Take Writer/Reader by `&mut` in consensus en/decoding (Dawid Ciężarkiewicz)
Pull request description:
Fix#1020 (see more relevant discussion there)
This definitely makes the amount of generics compiler
has to generate by avoding generating the same functions
for `R`, `&mut R`, `&mut &mut R` and so on.
old:
```
> ls -al target/release/deps/bitcoin-07a9dabf1f3e0266
-rwxrwxr-x 1 dpc dpc 9947832 Jun 2 22:42 target/release/deps/bitcoin-07a9dabf1f3e0266
> strip target/release/deps/bitcoin-07a9dabf1f3e0266
> ls -al target/release/deps/bitcoin-07a9dabf1f3e0266
-rwxrwxr-x 1 dpc dpc 4463024 Jun 2 22:46 target/release/deps/bitcoin-07a9dabf1f3e0266
```
new:
```
> ls -al target/release/deps/bitcoin-07a9dabf1f3e0266
-rwxrwxr-x 1 dpc dpc 9866800 Jun 2 22:44 target/release/deps/bitcoin-07a9dabf1f3e0266
> strip target/release/deps/bitcoin-07a9dabf1f3e0266
> ls -al target/release/deps/bitcoin-07a9dabf1f3e0266
-rwxrwxr-x 1 dpc dpc 4393392 Jun 2 22:45 target/release/deps/bitcoin-07a9dabf1f3e0266
```
In the unit-test binary itself, it saves ~100KB of data.
I did not expect much performance gains, but turn out I was wrong(*):
old:
```
test blockdata::block::benches::bench_block_deserialize ... bench: 1,072,710 ns/iter (+/- 21,871)
test blockdata::block::benches::bench_block_serialize ... bench: 191,223 ns/iter (+/- 5,833)
test blockdata::block::benches::bench_block_serialize_logic ... bench: 37,543 ns/iter (+/- 732)
test blockdata::block::benches::bench_stream_reader ... bench: 1,872,455 ns/iter (+/- 149,519)
test blockdata::transaction::benches::bench_transaction_deserialize ... bench: 136 ns/iter (+/- 3)
test blockdata::transaction::benches::bench_transaction_serialize ... bench: 51 ns/iter (+/- 8)
test blockdata::transaction::benches::bench_transaction_serialize_logic ... bench: 5 ns/iter (+/- 0)
test blockdata::transaction::benches::bench_transaction_size ... bench: 3 ns/iter (+/- 0)
```
new:
```
test blockdata::block::benches::bench_block_deserialize ... bench: 1,028,574 ns/iter (+/- 10,910)
test blockdata::block::benches::bench_block_serialize ... bench: 162,143 ns/iter (+/- 3,363)
test blockdata::block::benches::bench_block_serialize_logic ... bench: 30,725 ns/iter (+/- 695)
test blockdata::block::benches::bench_stream_reader ... bench: 1,437,071 ns/iter (+/- 53,694)
test blockdata::transaction::benches::bench_transaction_deserialize ... bench: 92 ns/iter (+/- 2)
test blockdata::transaction::benches::bench_transaction_serialize ... bench: 17 ns/iter (+/- 0)
test blockdata::transaction::benches::bench_transaction_serialize_logic ... bench: 5 ns/iter (+/- 0)
test blockdata::transaction::benches::bench_transaction_size ... bench: 4 ns/iter (+/- 0)
```
(*) - I'm benchmarking on a noisy laptop. Take this with a grain of salt. But I think
at least it doesn't make anything slower.
While doing all this manual labor that will probably generate conflicts,
I took a liberty of changing generic type names and variable names to
`r` and `R` (reader) and `w` and `W` for writer.
ACKs for top commit:
RCasatta:
ACK 1fea098dfb tested in downstream lib, space saving in compiled code confirmed
apoelstra:
ACK 1fea098dfb
Tree-SHA512: bc11994791dc97cc468dc9d411b9abf52ad475f23adf5c43d563f323bae0da180c8f57f2f17c1bb7b9bdcf523584b0943763742b81362880206779872ad7489f
b29ff9b715 Rename SchnorrSighashType::from_u8 -> from_consensus_u8 (Tobin C. Harding)
af16286679 Implement TryFrom sha256::Hash for TaprootMerkleBranch (Tobin C. Harding)
6b7b440cff Implement TryFrom<Key> for ProprietaryKey (Tobin C. Harding)
5c49fe775f Implement TryFrom<TaprootBuilder> for TapTree (Tobin C. Harding)
632a5db8d9 Implement TryFrom for WitnessVersion (Tobin C. Harding)
Pull request description:
Audit the whole codebase checking for any method that is of the form `from_foo` where foo is not an interesting identifier (like 'consensus' and 'standard'). Implement `TryFrom` for any such methods, deprecating the original.
Done as separate patches so any can be easily dropped if not liked.
ACKs for top commit:
apoelstra:
ACK b29ff9b715
Kixunil:
ACK b29ff9b715
Tree-SHA512: 40f1d96b505891080df1f7a9b3507979b0279a9e0f9d7cd32598bdc16c866785e6b13d5cb1face5ba50e3bc8484a5cd9c7f430d7abc86db9609962476dacd467
9bf959180b Optimize Witness Serialization (DanGould)
Pull request description:
fix#942
> self.to_vec() allocates, it should be possible to avoid it - just feed the items into serializer.
based on https://github.com/rust-bitcoin/rust-bitcoin/pull/1068
ACKs for top commit:
Kixunil:
ACK 9bf959180b
apoelstra:
ACK 9bf959180b
Tree-SHA512: 14553dfed20aee50bb6361d44986b38556cbb3e112e1b4d9e3b401c3da831b6bdf159089966254cf371c225ae929fc78516c96a6114b40a7bc1fda7305295e4a
We allocated a new vector when serializing a `Witness`. That was
inefficient and unnecessary. Use `serialize_seq` to feed the witness
elements directly into the serializer.
Optimize `Witness` serialization by removing the allocation.
When `rust-bitcoin` was started in 2014 the SPDX license list and short
identifiers where not a thing. Now that we have short identifiers and
they are gaining popularity in other projects we can consider using
them.
- Add links to the SPDX website in the readme
- Shorten the author section to a single line
- Remove all the licence information in each file and replace it with an
SPDX ID (see https://spdx.dev/ids/#how)
Of note:
- If the author of a file is explicitly listed, maintain this
information
- If the 'author' is listed as the generic 'Rust Bitcoin developers'
just remove the attribution, this is implicit. This does loose the date
info but that can be seen at any time from the git index using
`git log --follow --format=%ad --date default <FILE> | tail -1`
Last release, before we had access to `non_exhaustive` we added some
fancy types to enable conditionally having a `bitcoinconsensus::Error`.
Now that we have bumped the MSRV and have already added `non_exhaustive`
to the `Error` type in question, we can use a compiler attribute to
conditionally include the `bitcoinconsensus` error.
Remove `Uninhabited` and its usage.
0bae41129d Make `opcode::to_u8` a const function (Matt Corallo)
Pull request description:
In general, if a function can be const, it should be, and this one
trivially can be, so it should be.
ACKs for top commit:
tcharding:
ACK 0bae41129d
apoelstra:
ACK 0bae41129d
Tree-SHA512: 0df883894ec65dac1b709c581ffc3d2daca737561d05adb971dfef736e4147c59ea66cdc0520296c619e13e1dac70c07cb062b61304541cf488262244f313009
The `u8` parameter in the `SchnorrSighashType` constructor is a
consensus valid `u8`. Re-name the constructor to make this explicit.
Deprecate `from_u8` as is typical.
TryFrom` became available in Rust 1.34 so we can use it now we have
bumped our MSRV.
Add a macro for implementing `TryFrom` for various lists of
`sha256::Hash` types. Use the macro to for vec, slice, and boxed slice.
TryFrom` became available in Rust 1.34 so we can use it now we have
bumped our MSRV.
Implement `TryFrom<Key>` for `ProprietaryKey` and deprecate the
`from_key` method.
TryFrom` became available in Rust 1.34 so we can use it now we have
bumped our MSRV.
Implement `TryFrom<TaprootBuilder>` for `TapTree` and deprecate the
`from_builder` method.
We have a bunch of 'from' methods that are fallible; `TryFrom` became
available in Rust 1.34 so we can use it now we have bumped our MSRV.
Implement the various `WitnessVersion` from methods using `TryFrom` and
deprecate the originals.
bea5569cd3 Remove duplicate must_use (Tobin C. Harding)
Pull request description:
Clippy emits:
warning: this function has an empty `#[must_use]` attribute, but returns a type already marked as `#[must_use]`
This is because the return type of the function `legacy_encode_signing_data_to` is `EncodeSigningDataResult` which is
already marked as `must_use`. There is no need to have `must_use` on the function also.
##
Hey apoelstra, this PR is needed before any other PR can get a green CI run. The PR that introduced this warning must have had a green CI run before the 'add clippy to CI' PR merged allowing it to merge without re-running CI.
ACKs for top commit:
apoelstra:
ACK bea5569cd3
Kixunil:
ACK bea5569cd3
Tree-SHA512: 27b606685bc2d5317a5e332431511af9b1017bf58462c283b322e5b6faf645fd8e006455af3d6888ab2c3c680b11e4b89f538f26440f4f1422e0daabc61825ac
Clippy emits:
warning: this function has an empty `#[must_use]` attribute, but
returns a type already marked as `#[must_use]`
This is because the return type of the function
`legacy_encode_signing_data_to` is `EncodeSigningDataResult` which is
already marked as `must_use`. There is no need to have `must_use` on the
function also.
I'm guessing this got through to master because we only just added
clippy to CI.
Fix#1020 (see more relevant discussion there)
This definitely makes the amount of generics compiler
has to generate by avoding generating the same functions
for `R`, &mut R`, `&mut &mut R` and so on.
old:
```
> ls -al target/release/deps/bitcoin-07a9dabf1f3e0266
-rwxrwxr-x 1 dpc dpc 9947832 Jun 2 22:42 target/release/deps/bitcoin-07a9dabf1f3e0266
> strip target/release/deps/bitcoin-07a9dabf1f3e0266
> ls -al target/release/deps/bitcoin-07a9dabf1f3e0266
-rwxrwxr-x 1 dpc dpc 4463024 Jun 2 22:46 target/release/deps/bitcoin-07a9dabf1f3e0266
```
new:
```
> ls -al target/release/deps/bitcoin-07a9dabf1f3e0266
-rwxrwxr-x 1 dpc dpc 9866800 Jun 2 22:44 target/release/deps/bitcoin-07a9dabf1f3e0266
> strip target/release/deps/bitcoin-07a9dabf1f3e0266
> ls -al target/release/deps/bitcoin-07a9dabf1f3e0266
-rwxrwxr-x 1 dpc dpc 4393392 Jun 2 22:45 target/release/deps/bitcoin-07a9dabf1f3e0266
```
In the unit-test binary itself, it saves ~100KB of data.
I did not expect much performance gains, but turn out I was wrong(*):
old:
```
test blockdata::block::benches::bench_block_deserialize ... bench: 1,072,710 ns/iter (+/- 21,871)
test blockdata::block::benches::bench_block_serialize ... bench: 191,223 ns/iter (+/- 5,833)
test blockdata::block::benches::bench_block_serialize_logic ... bench: 37,543 ns/iter (+/- 732)
test blockdata::block::benches::bench_stream_reader ... bench: 1,872,455 ns/iter (+/- 149,519)
test blockdata::transaction::benches::bench_transaction_deserialize ... bench: 136 ns/iter (+/- 3)
test blockdata::transaction::benches::bench_transaction_serialize ... bench: 51 ns/iter (+/- 8)
test blockdata::transaction::benches::bench_transaction_serialize_logic ... bench: 5 ns/iter (+/- 0)
test blockdata::transaction::benches::bench_transaction_size ... bench: 3 ns/iter (+/- 0)
```
new:
```
test blockdata::block::benches::bench_block_deserialize ... bench: 1,028,574 ns/iter (+/- 10,910)
test blockdata::block::benches::bench_block_serialize ... bench: 162,143 ns/iter (+/- 3,363)
test blockdata::block::benches::bench_block_serialize_logic ... bench: 30,725 ns/iter (+/- 695)
test blockdata::block::benches::bench_stream_reader ... bench: 1,437,071 ns/iter (+/- 53,694)
test blockdata::transaction::benches::bench_transaction_deserialize ... bench: 92 ns/iter (+/- 2)
test blockdata::transaction::benches::bench_transaction_serialize ... bench: 17 ns/iter (+/- 0)
test blockdata::transaction::benches::bench_transaction_serialize_logic ... bench: 5 ns/iter (+/- 0)
test blockdata::transaction::benches::bench_transaction_size ... bench: 4 ns/iter (+/- 0)
```
(*) - I'm benchmarking on a noisy laptop. Take this with a grain of salt. But I think
at least it doesn't make anything slower.
While doing all this manual labor that will probably generate conflicts,
I took a liberty of changing generic type names and variable names to
`r` and `R` (reader) and `w` and `W` for writer.
Andrew Poelstra
Noah Lanson
DanGould
Tobin C. Harding
Arturo Marquez
junderw
Dawid Ciężarkiewicz
Matt Corallo