[issue20387] tokenize/untokenize roundtrip fails with tabs

[Terry J. Reedy]

Terry J. Reedy added the comment:

The untokenize docstring has a stronger guarantee, and in the direction you were claiming. "Round-trip invariant for full input: Untokenized source will match input source exactly". For this to be true, the indent strings must be saved and not replaced by spaces.

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<http://bugs.python.org/issue20387>
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