Option values cannot be negative numbers

[mojodna]

It's not currently possible to set option values to negative numbers (w/o using =), as demonstrated in this diff to the tests:

diff --git i/test/yargs-parser.js w/test/yargs-parser.js
index e290110..07d7335 100644
--- i/test/yargs-parser.js
+++ w/test/yargs-parser.js
@@ -116,6 +116,7 @@ describe('yargs-parser', function () {
       '-z', '1e7',
       '-w', '10f',
       '--hex', '0xdeadbeef',
+      '--negative', '-1',
       '789'
     ])
     argv.should.have.property('x', 1234).and.be.a('number')
@@ -123,6 +124,7 @@ describe('yargs-parser', function () {
     argv.should.have.property('z', 1e7).and.be.a('number')
     argv.should.have.property('w', '10f').and.be.a('string')
     argv.should.have.property('hex', 0xdeadbeef).and.be.a('number')
+    argv.should.have.property('negative', -1).and.be.a('number')
     argv.should.have.property('_').and.deep.equal([789])
     argv._[0].should.be.a('number')
   })

I'm actually more interested in being able to parse an array of numbers, some of which may be negative (e.g. --bounds "-180 -90 180 90", possibly even unquoted), but this appears to be the first snag along that path.

[mojodna]

Yay, thank you!!