a7d059151e Assert error type (yancy)
2f7e74da45 Add MathOp helper methods (yancy)
Pull request description:
Follow up from https://github.com/rust-bitcoin/rust-bitcoin/pull/4428 to assert the error type which I agree improves the test.
Added some helper functions since it can be nice to see what type of overflow happened.
ACKs for top commit:
tcharding:
ACK a7d059151e
apoelstra:
ACK a7d059151eb47bf4202302604309c95c0d66371d; successfully ran local tests
Tree-SHA512: e1b3eba640de2e4f98e075270fd797582601c541e1eebef2959a4e609bf51129e8ad38baab1253b40474c39f82ee4802658ec545cc5c3590637f2ddb13f873f7