PEP 739: specify how to handle conflicting installs

Signed-off-by: Filipe Laíns <lains@riseup.net>

Author: FFY00

peps/pep-0739.rst

@@ -52,6 +52,14 @@ platform-independent standard library directory (``stdlib``, eg.
 ``/usr/lib/python3.14/build-details.json``), **UNLESS** unfeasible due to
 technical limitations.
 
+When multiple Python installations share the same prefix, to resolve conflicts,
+distributors should prepend an extension to the file — eg.
+``build-details.XXX.json``, ``build-details.YYY.json``, etc.
+The extension text is determined by the distributor, but it **SHOULD** indicate
+the difference(s) between the installations — eg.
+``build-details.x86_64-free-threading.json``,
+``build-details.arm64_v8a-free-threading.json``,
+``build-details.x86_64.json``, etc.
 
 .. attention::