libs/mocha/should.js
function(val, desc){
        this.assert(
            val.valueOf() === this.obj
            , function(){ return 'expected ' + this.inspect + ' to equal ' + i(val) + (desc ? " | " + desc : "") }
            , function(){ return 'expected ' + this.inspect + ' to not equal ' + i(val) + (desc ? " | " + desc : "") }
            , val);
        return this;
    }
function(val, desc){
        this.assert(
            val.valueOf() === this.obj
            , function(){ return 'expected ' + this.inspect + ' to equal ' + i(val) + (desc ? " | " + desc : "") }
            , function(){ return 'expected ' + this.inspect + ' to not equal ' + i(val) + (desc ? " | " + desc : "") }
            , val);
        return this;
    }
function ( val , desc ) { this . assert ( val . valueOf ( ) === this . obj , function ( ) { return 'expected ' + this . inspect + ' to equal ' + i ( val ) + ( desc ? " | " + desc : "" ) } , function ( ) { return 'expected ' + this . inspect + ' to not equal ' + i ( val ) + ( desc ? " | " + desc : "" ) } , val ) ; return this ; }
Assert strict equal.

@param {Mixed} val
@param {String} description
@api public
Assert strict equal .