nl_tokens: Returns the key of the item with the lowest value in the object .
pl_tokens: function keyOfMin ( o , func ) { if ( ! o || typeof o !== 'object' ) return o ; if ( libs . object . size ( o ) === 0 ) return ; if ( ! ( func instanceof Function ) ) func = undefined ; if ( typeof o !== 'object' ) return o ; var min , minValue , minKey ; if ( ! func ) { min = libs . object . first ( o ) ; minKey = libs . object . keys ( o ) [ 0 ] ; libs . object . each ( o , 1 , function ( item , key ) { if ( item <= min ) { min = item ; minKey = key ; } } ) ; } else { min = libs . object . <mask> ( o ) ; minValue = func . call ( min , min ) ; minKey = libs . object . keys ( o ) [ 0 ] ; libs . object . each ( o , 1 , function ( item , key ) { var value = func . call ( item , item ) ; if ( value <= minValue ) { min = item ; minValue = value ; minKey = key ; } } ) ; } return minKey ; }