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This release improves validation of the ``alphabet`` argument to the
:func:`~hypothesis.strategies.text` strategy. The following misuses
are now deprecated, and will be an error in a future version:
- passing an unordered collection (such as ``set('abc')``), which
violates invariants about shrinking and reproducibility
- passing an alphabet sequence with elements that are not strings
- passing an alphabet sequence with elements that are not of length one,
which violates any size constraints that may apply
Thanks to Sushobhit for adding these warnings (:issue:`1329`).