Do we have a format that always includes a decimal point and a given
number of significant digits, but otherwise drops unnecessary
characters? For example, if I wanted 5 digits, I'd want the following:
Round to 5 digits:
1.234567 -> "1.2346"
Drop unnecessary zeros:
1.23 -> "1.23"
Force inclusion of a decimal point:
1 -> "1."
Duncan Murdoch
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