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                // do as self.isany()
 
self.isa = function(/* args */) {
  
  if (arguments.length > 0) {
 
    // Prepare arguments and constructors
    var args = Array.prototype.slice.call(arguments), // args provide an .isany() feature; could do in sep method
        makers = [] //: list
 
    for (var i in args) makers.push(args[i].constructor)
  } 
  else var makers = [[]]
 
  // Handle short-hand names for types
  var types = []
  for (var it in makers) {
    types[it] = ( makers[it] === Number ?  "num" : 
                ( makers[it] === String ?  "chars" : 
                ( makers[it] === Array ?   "list" : 
                ( makers[it] === Object ?  "hash" : "unknown" ) ) ) )
    
  }
 
  // Handle not getting args
  if (makers.length === 1) { return no(args) ? makers[0] : types[0] === makers[0]  }
  var done = []
  for (var its in types) {
    if (self[its].isa(types[its])) done.push(true)
    else done.push(false)
  } 
  return done
 
}
 
 
self.isa = function(types) { // doesn't want hashes
  // self is a type in types?
  var makers = []
  if (types.constructor === Number || types.constructor === String)
    types = [self]
  for (var i in types) 
    makers.push(args[i].constructor)
  
  // Handle short-hand names for types
  var types = []
  for (var i in makers) {
    types[it] = ( makers[it] === Number ?  "num" : 
                ( makers[it] === String ?  "chars" : 
                ( makers[it] === Array ?   "list" : 
                ( makers[it] === Object ?  "hash" : "unknown" ))))
  }
 
  // Handle not getting args
  if (makers.length === 1) { return no(args) ? makers[0] : types[0] === makers[0]  }
  var done = []
  for (var it in types) {
    if ( self[it].constructor === makers[it] ) done.push( true )
    else done.push( false )
  } 
  return done
 
}