Should john smith nee x x read like JOHN SMITH NEE X X? A shape-only numeral in a maiden clause #731

rules/T4 says a name written wholly in one case reads as its capitals, but a maiden clause holding two shape-only numerals doesn't:

>>> parse("john smith nee x x")   # suffix 'x', maiden 'x', suffix-or-name
>>> parse("JOHN SMITH NEE X X")   # maiden 'X X', no report
>>> parse("john smith nee v v")   # suffix 'v', maiden 'v' -- as JOHN SMITH NEE V V

Both xs carry the initial tag in both spellings, so something in the maiden take reads more than the tag. The likely place is #610's candidate loop for a shape-only numeral (VI to X). This mismatch was already there before PR #729; its code review found it. No _ONE_CASE_SHAPES row puts a numeral after a letter in a clause.

To settle before implementing: which reading is right for the clause? Should the fix be a new grid shape ({a} {b} nee {n} {n}), and should letters x and vi be added?