[issue4561] Optimize new io library

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The previous implementation only returns bytes and does not translate
newlines. For this particular case, indeed, the plain old FILE* based
object is faster.

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nosy: +amaury.forgeotdarc

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