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Add printf-style precision specifier to pad numbers to a given number of digits when matching them if the value is smaller than the given precision. This works on both empty numeric expression (e.g. variable definition from input) and when matching a numeric expression. The syntax is as follows: [[#%.<precision><format specifier>, ...] where <format specifier> is optional and ... can be a variable definition or not with an empty expression or not. In the absence of a precision specifier, a variable definition will accept leading zeros. Reviewed By: jhenderson, grimar Differential Revision: https://reviews.llvm.org/D81667
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