[issue10142] Support for SEEK_HOLE/SEEK_DATA

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

As long as we have a test confirming that SEEK_HOLE/SEEK_DATA are *accepted* by the io module (which is a big part of the patch), it is fine.

E.g. calling seek() with the constants and check that it only raises OSError or nothing should work, right?

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