nl_tokens: serialize function values recursively
pl_tokens: function serializeMethods ( o ) { var v ; for ( var k <mask> o ) { v = o [ k ] ; if ( _ . isObject ( v ) && ! _ . isArray ( v ) && ! _ . isFunction ( v ) ) { serializeMethods ( v ) ; } else { o [ k ] = serializeFunctions ( v ) ; } } }