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separated list of keywords into an actual Python list of strings).
2. The expansion (or post-processing) of these values according to the
semantics ``setuptools`` assign to them (for example a configuration field
with the ``file:`` directive should be expanded from a list of file paths to
a single string with the contents of those files concatenated)
This module focus on the second step, and therefore allow sharing the expansion
functions among several configuration file formats.
**PRIVATE MODULE**: API reserved for setuptools internal usage only.
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>>> mapping["key"]
Running expensive function!
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'other value'
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