Update test suite for `cmp`
Update test suite for `cmp`

* Add `cmp` check in `T` assertion helper
* Add `cmp` comment references where appropriate

favio41/big-js,loriopatrick/big.js,favio41/big-js,arroinua/big.js,poporul/big.js,arrowrowe/big.js,favio41/big-js,MikeMcl/big.js,arroinua/big.js,arroinua/big.js,loriopatrick/big.js,poporul/big.js,javiercejudo/linear-big.js,poporul/big.js,messiasxavier/node,messiasxavier/node,javiercejudo/linear-big.js,messiasxavier/node,arrowrowe/big.js,loriopatrick/big.js,MikeMcl/big.js,MikeMcl/big.js,arrowrowe/big.js