Update how-it-works.md to clarify phrase "quite hot"

[PPPDUD]

See above.

[CST1229]

i'm fairly sure "quite hot" here means "gets called very often" (by the compiler). all of the compiler output is very rarely read by humans

[PPPDUD]

i'm fairly sure "quite hot" here means "gets called very often" (by the compiler). all of the compiler output is very rarely read by humans

I agree, but the phrase sounds a bit out-of-place to me.