MAINT: Simplify string arena growth strategy (#29885) #29950
Merged
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Backport of #29885.
Not sure if there is any downsides to this, but I think this is much simpler and pretty much identical.
Plus, I don't quite like that the 1.25 factor could be large, although I admit it seems very unlikely (maybe impossible) to actually trigger a problem there.
EDIT: As a note, I have a similar function that caps overallocation and increments in "neat" values (which double as a minimum overallocation amount). I somewhat assumed that doesn't matter much, but we could definitely do either or both here as well.