Not using `match` on floating point values anymore.
Not using `match` on floating point values anymore.

The use of literal pattern matching on floating points has been
deprecated. It currently produces a warning, but will eventually
cause a compilation error.

See: https://github.com/rust-lang/rust/issues/41620

placrosse/capnproto-rust,dwrensha/capnproto-rust,dwrensha/capnpc-rust,tempbottle/capnproto-rust