Martin Panter added the comment:

In theory, TextIOWrapper could rewrite the last bit of the file (or the whole 
file) to have the requested number of characters. But I wonder if it is worth 
it; maybe deprecation is better. Do you have a use case for any of these bugs, 
or are you just playing around to see what the methods do?

In Issue 12922, seek() and tell() were (re-)defined for TextIOBase, but the 
situation with truncate() was apparently not considered.

Perhaps the write()–read() bug is related to Issue 12215.

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nosy: +martin.panter

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