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* {:.PREC?} already had legitimately useful behavior (recursive formatting of structs using
fixed precision for floats) and I suspect that changes to the output there would be unwelcome.
(besides, precision introduces sinister edge cases where a number can be rounded up to one
of the thresholds)
Thus, the new behavior of Debug is, "dynamically switch to exponential, but only if there's
no precision."
* This could not be implemented in terms of float_to_decimal_common without repeating the branch
on precision, so 'float_to_general_debug' is a new function. The name is '_debug' instead of
'_common' because the considerations in the previous bullet make this logic pretty specific
to Debug.
* 'float_to_decimal_common' is now only used by Display, so I inlined the min_precision argument
and renamed the function accordingly.
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