PyUnicode_FSDecoder() is used in following functions in the stdlib:
compile()
symtable.symtable()
parser.compile()
parser.compilest()
zipimporter.zipimporter()
_imp.load_dynamic() (before 3.5)
This is behavior of PyUnicode_FSDecoder() from the start (issue9542). All above functions accepted only str in 3.1, thus accepting bytes object and others was new feature.
None tests are failed if reject non-str and non-bytes argument in PyUnicode_FSDecoder(). But none tests are failed even if disable support of bytes argument (there is a lack of tests for bytes path).
What should we do?
1. Add a warning when the argument neither str nor supporting the buffer protocol.
2. Drop support of non-str and not supporting the buffer protocol arguments without a warning.
3. Drop support of non-str and not supporting the buffer protocol arguments without a warning, and add a warning when the argument neither str nor bytes.
4. Drop support of non-str and non-bytes arguments without a warning.