nl_tokens: Filters an array or object using only the types allowed . That is if the item in the array is of a type listed in the arguments then it will be added to the filtered array . In this case array is a valid type .
pl_tokens: function only ( o , types ) { types = libs . object . toArray ( arguments ) ; types . shift ( ) ; // Allows the 'plural' form of the type... libs . object . each ( types , function ( type , key ) { this [ key ] = type . replace ( / s$ / , '' ) ; } ) ; if ( typeof o !== 'object' || ! o ) return o ; var isArray = o instanceof Array ? true : false , filtered = isArray ? [ ] : { } , typeArr = types . indexOf ( 'array' ) , typeObj = types . indexOf ( 'object object' ) ; libs . object . each ( o , function ( item , key ) { var typeItem = types . indexOf ( typeof item ) ; if ( typeObj !== - 1 && typeArr === - 1 ) { if ( ( typeof item === 'object' && ! ( item instanceof Array ) ) || ( typeof item !== 'object' && typeItem !== - 1 ) ) { if ( isArray ) filtered . push ( <mask> ) ; else filtered [ key ] = item ; } } else if ( typeObj !== - 1 && typeArr !== - 1 ) { types . push ( 'object' ) ; if ( typeItem !== - 1 ) { if ( isArray ) filtered . push ( item ) ; else filtered [ key ] = item ; } } else if ( typeItem !== - 1 || ( item instanceof Array && typeArr !== - 1 ) ) { if ( isArray ) filtered . push ( item ) ; else filtered [ key ] = item ; } } ) ; return filtered ; }