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Instead of writing `foo|f=s` you can also write `foo|f:s` for a GetOpt::Long
option spec [1], thus making the argument optional.
The current implementation of `_spec_to_help` will wrongly render this as two
long options:
--dirport, --d:9030
directory port
instead of a short and a long one:
-d, --dirport=INTEGER
directory port
This commit fixes the the parsing of the spec, detection of the type and adds
tests for a few common cases this could be used in.
[1] http://perldoc.perl.org/Getopt/Long.html#Summary-of-Option-Specifications
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