5023

Several bugs found after performing multiple loops through convert-data.

This has been a general pattern: given how unsafe the x86 'language' is,
the regular amount of testing with a single input doesn't really give sufficient
confidence. Ever-present is the possibility that I forgot to pop something
from the stack, either a spilled register or a local. Calling functions
multiple times seems to help detect such bugs. So far I've been doing this
extra level of testing implicitly when I build the next higher abstraction.
But with `convert-data` the buck stopped, and much painful debugging ensued.

One thing that would help is if `write` on streams didn't remain silent
on overflow. But we actually need that sometimes, when streams are used
as buffers.

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