Off by one in writeBlocksRaw

[BebeSparkelSparkel]

writeBlocksRaw uses the same bounds check as writeBlocksCRLF. writeBlocksRaw will always only write one character while writeBlocksCRLF can write two.

Seems like it should actually be

          | n >= len -> commit n True{-needs flush-} False >>= outer s

[mitchellwrosen]

Can someone comment on the user-facing impact of this bug?

[BebeSparkelSparkel]

Under utilization of the char buffer by one byte.

The only time this would cause a problem is if the char buffer had a size of 1 which is never the case.

[Bodigrim]

@mitchellwrosen this is not a vulnerability, just an opportunity to polish.