[io grant] Make IO::Handle.put($x) about 5%-35% faster
[io grant] Make IO::Handle.put($x) about 5%-35% faster

1-char is about 35% faster and it goes down to 5% at 100_000 chars.
At that point, I'm hitting some sort of system bottleneck; if I
bench new method first, it ends up being 2x faster, if I bench old
method first, it ends up being 2x faster...

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