Type error in earlier Perl versions on Windows

[barefootcoder]

On CPAN Testers, our latest dev release throws errors on Windows for all versions of Perl prior to 5.14 (of which there are only two so far: one 5.10.1, and the other 5.12.2). This is the error:

Attribute (max_argv_size) does not pass the type constraint because: Validation failed for 'Inf|Int' with value 1.#INF at C:/strawberry/perl/site/lib/Mouse/Util.pm line 383.
    Mouse::Util::throw_error('Mouse::Meta::Attribute=HASH(0xd3993c)', 'Attribute (max_argv_size) does not pass the type constraint b...', 'data', '1.#INF', 'depth', -1) called at C:\strawberry\cpan\build\Method-Signatures-20140920.1910_001-gC1jgO\blib\lib/Method/Signatures/Signature.pm line 174                                                                      
    Method::Signatures::Signature::_calculate_max_args('Method::Signatures::Signature=HASH(0xd61184)') called at C:\strawberry\cpan\build\Method-Signatures-20140920.1910_001-gC1jgO\blib\lib/Method/Signatures/Signature.pm line 162               
    Method::Signatures::Signature::BUILD('Method::Signatures::Signature=HASH(0xd61184)', 'HASH(0xd61094)') called at C:\strawberry\cpan\build\Method-Signatures-20140920.1910_001-gC1jgO\blib\lib/Method/Signatures.pm line 828                         
    eval {...} called at C:\strawberry\cpan\build\Method-Signatures-20140920.1910_001-gC1jgO\blib\lib/Method/Signatures.pm line 828
    Method::Signatures::parse_proto('Method::Signatures=HASH(0xd60474)', '$a, $b, @c') called at C:/strawberry/perl/site/lib/Devel/Declare/MethodInstaller/Simple.pm line 65
    Devel::Declare::MethodInstaller::Simple::parser('Method::Signatures=HASH(0xd60474)', 'method', 4, 1) called at C:/strawberry/perl/site/lib/Devel/Declare/MethodInstaller/Simple.pm line 24                                                         
    Devel::Declare::MethodInstaller::Simple::__ANON__('method', 4) called at C:/strawberry/perl/site/lib/Devel/Declare.pm line 276
    Devel::Declare::linestr_callback('const', 'method', 4) called at t/array_param.t line 17

Note that this is an error from lib/Method/Signatures/Signature.pm and not from any particular test.

Since the range of failures is so narrow, I don't want to hold up promoting this to an official release, but I also don't want to ignore the problem. Thus, I'm creating this issue so it doesn't get lost until I have time to investigate it further.