Default value should be used when the flag is specified with no value

[sindresorhus]

Actual:

yargs(['--foo'], {number: ['foo'], default: {foo: 1}});
//=> { _: [], foo: undefined }

Expected:

yargs(['--foo'], {number: ['foo'], default: {foo: 1}});
//=> { _: [], foo: 1 }

Applies to string and number.

Alternatively, it could throw, since --foo is technically an incorrect value, but that might be too opinionated for yargs-parser.

[bcoe]

@sindresorhus please take + [email protected] for a spin, it will now use default values if no right-hand side is provided to option.