implement missing create_nofreeze()

Author: loveencounterflow

src/datoms.coffee

@@ -25,6 +25,12 @@ LFT_nofreeze              = LFT.nofreeze
 @_copy                    = LFT_nofreeze._copy.bind LFT
 @_nofreeze                = false
 
+#-----------------------------------------------------------------------------------------------------------
+@create_nofreeze = ->
+  R = new @Pipedreams()
+  R._nofreeze = true
+  return R
+
 #-----------------------------------------------------------------------------------------------------------
 @freeze = ( d ) -> if @_nofreeze then LFT_nofreeze.freeze d else LFT.freeze d
 @thaw   = ( d ) -> if @_nofreeze then LFT_nofreeze.thaw   d else LFT.thaw   d

src/tests/immutablity.coffee

@@ -92,6 +92,7 @@ PD                        = require '../..'
 @[ "PD.set() accepts objects like assign() (nofreeze)" ] = ( T, done ) ->
   PDNF = PD.create_nofreeze()
   d = PDNF.new_datom '^foo', { x: 42, }
+  T.ok not Object.isFrozen d
   d = PDNF.set    d, { x: 556, vnr: [ 1, 2, 4, ], }
   T.ok d.x is 556
   T.eq d.vnr, [ 1, 2, 4, ]