ahaaa, yeah, i don't personally do any runtime switching but i hear that as a deal-breaker from other folks.

it's interesting – i've found that zig tends to extend my vectors to the native width of the platform and then operate on them there. e.g. i had a `@Vector(2, f32)` that i was using as a demo and the generated assembly was promoting it to 256 bits and using avx2 instructions on it!