nl_tokens: / * Internal method for inspecting a value and providing a string representation of that value .
pl_tokens: function _inspect ( inspecting , inspection = '' , seen = [ ] , times = 0 , indent = 2 ) { let type = getType ( inspecting ) ; switch ( type ) { case types . undefined : return 'undefined' ; case types . null : return 'null' ; case types . function : let name = inspecting . name ? ': ' + inspecting . <mask> : '' ; return ` ${ name } ` ; case types . string : return ` ${ inspecting } ` ; case types . array : if ( seen . indexOf ( inspecting ) > - 1 ) return '[Circular]' ; times ++ ; inspection = '[ ' ; seen . push ( inspecting ) ; var inspected = [ ] ; for ( let val of inspecting ) inspected . push ( _inspect ( val , inspection , seen , times ) ) ; if ( inspected . length === 0 ) return '[]' ; let length = inspected . reduce ( ( prev , cur ) => { return prev + cur . length ; } , 0 ) ; if ( length > 60 ) inspection = '[ ' + inspected . join ( ',\n' + ' ' . repeat ( times * indent ) ) + ' ]' ; else inspection = '[ ' + inspected . join ( ', ' ) + ' ]' ; return inspection ; case types . object : if ( seen . indexOf ( inspecting ) > - 1 ) return '[Circular]' ; times ++ ; inspection = '{ ' ; seen . push ( inspecting ) ; let objInspected = [ ] ; if ( inspecting instanceof Error ) // to match nodejs inspect methods
   objInspected . push ( '[' + inspecting . toString ( ) + ']' ) ; for ( let [ key , val ] of each ( inspecting ) ) objInspected . push ( key + ': ' + _inspect ( val , inspection , seen , times ) ) ; if ( objInspected . length === 0 ) return '{}' ; let objLength = objInspected . reduce ( ( prev , cur ) => { return prev + cur . length ; } , 0 ) ; if ( objLength > 60 ) inspection = '{\n' + ' ' . repeat ( times * indent ) + objInspected . join ( ',\n' + ' ' . repeat ( times * indent ) ) + ' }' ; else inspection = '{ ' + objInspected . join ( ', ' ) + ' }' ; return inspection ; case types . map : case types . set : return _inspect ( [ ... inspecting ] ) ; case types . number : case types . boolean : default : if ( inspecting instanceof Error ) return '[' + inspecting . toString ( ) + ']' ; return inspecting . toString ( ) ; } }