> the PR allows using either type of quote when typing completions.

Only if one types a quote before the box pops up.  In this case, there is no auto popup and one must request completions.  The box then uses the quote typed.  Thereafter, there is no choice. Backspacing to delete the quote and typing the another one disables matching.

If one type >>> d[ and pauses long enough for the auto-popup, (I have 'wait' set to 200 milleseconds), one must similarly match the existing quote, because jumping ahead requires a string match.  Because of the bytes inclusion, the match much include the opening quote, because otherwise an initial 'b' would be ambiguous.  Without bytes, we could either removed the quotes from the box or automatically add an open quote.