pyScalar's docstring named only the two code points CPython refuses
anywhere in source. A bare quote, a trailing odd backslash, and a bare
LF/CR break the Literal line just as fatally, and JSON.stringify is what
covers those too. The argument also leaned on an unstated coincidence:
every escape JSON.stringify can emit is a Python escape for the same
character, which is why the emitted text both parses and decodes back to
the declared value. Say both, and assert the second class.
"statement head" does not describe `case`, whose clause block is not a
statement. Split the positions three ways.
Add the mode 'both' by python assembly, pinning the mode-by-language
matrix rather than leaving it to the shared code path.
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