Fix flag parser to handle negative numbers#158
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This pull request refines the parsing logic for short flag formats in the
FlagParserclass. The main improvement ensures that short flags which are actually numbers (e.g.,-1,-.5) are not incorrectly interpreted as flag groups.Flag parsing improvements:
FlagParser.javato check if the flag after the dash is a digit or a dot, and if so, treats it as a value rather than a group of flags. This prevents misparsing numeric arguments as flag groups.