blurb

Author: encukou

Misc/NEWS.d/next/C_API/2025-03-20-16-29-58.gh-issue-131510.HkJdvy.rst

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+C structures for :py:type:`str` instances, and a macro for querying a
+string's memory layout, are deprecated and planned for removal in Python
+3.16: :c:type:`PyASCIIObject`, :c:type:`PyCompactUnicodeObject`,
+:c:type:`PyUnicodeObject`, :c:type:`PyUnicode_IS_COMPACT`. Unstable API is
+added to ease migration for known use cases.