Zig build benchmarks

[StringNick]

Hi more a question, why zig benchmarks building without flag -Doptimize=ReleaseFast?
On macbook m1 pro in binarytree test it gives 2x time perfomance increase

[t924417424]

@hanabi1224

[ElekCorp]

I think it is turned on but writen in the include/zig/build.zig