allow boolean switch with '--enable-foo=true/false' #318
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This is a try to implement the #313, however this make
flag()applynargs(0,1), and break assumption for some of the test.For example:
program.parse_args({"./test", "--enable-foo", "dump"}), with--enable-fooset withflag(), the positional argumentdumpwill be consumed by the flag and cause trouble.And I'm not sure, this seems to be in consistent with the original design, there may be better solutions.