Add round_ties_even to Float/Core and Real
#350
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Objective
Since Rust 1.77,
round_ties_evenwas added tof32andf64in the standard library. This function is used within WGPU, and as a part of a push forno_stdsupport, this function will need to be shimmed. It could be shimmed within Naga, but this functionality may have value to other users ofnum-traits.Solution
round_ties_eventoFloatCore,Float, andRealwith a default implementation (not a breaking change)has_round_ties_evenconfiguration check to allow detectinground_ties_evenprovided by the standard library in Rust 1.77 and above (not a breaking change)round_ties_evenmatches the implementation instdfor thef32type (assuming it is equally valid forf64)Notes
TheResolved usingmsrv_1_77feature increases MSRV to 1.77, which is a typical arrangement (e.g.,serdefeatures will typically elevate MSRV). If/whennum-traitsadvances past MSRV 1.77, this feature can become a no-op without any breaking changes.build.rsandautocfg.num-traits, please let me know if there's anything I can do to help!