Re^4: A plague on all your features

Actually, the whole v: thing is the hints, not just the fea= portion. And we see another difference: The %. Not sure what it means, but it relates to %^H. Presumably the presence of %^H. Again, present for b but not c.

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Re^5: A plague on all your features by ikegami (Patriarch) on Mar 07, 2023 at 01:17 UTC
`b` has a `%^H` and `c` doesn't. The extra time spent is clearly spent accessing (copying?) this hash. Why doesn't `c` have a `%^H`? Some hints are found in `$^H` and some are in `%^H`. I think what's happening is that `use 5.010;` avoids creating `%^H` just to set flags that are on by default (such as `indirect`). `use feature ":5:10";`, on the other hand, clearly does create this hash. There's a problem with this answer. `say` and a couple other flags which aren't set by default appear to be in `%^H`. Maybe they are found in both `$^H` and `%^H`?	[reply] [d/l] [select]

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Re^5: A plague on all your features
by ikegami (Patriarch) on Mar 07, 2023 at 01:17 UTC

b has a %^H and c doesn't. The extra time spent is clearly spent accessing (copying?) this hash.

Why doesn't c have a %^H?

Some hints are found in $^H and some are in %^H.

I think what's happening is that use 5.010; avoids creating %^H just to set flags that are on by default (such as indirect).

use feature ":5:10";, on the other hand, clearly does create this hash.

There's a problem with this answer. say and a couple other flags which aren't set by default appear to be in %^H. Maybe they are found in both $^H and %^H?

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