Add bin and edit workflow

bin/gems/hashery-2.1.2/lib/hashery/static_hash.rb

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+module Hashery
+
+  # StaticHash ia a Hash object which raises an error if any
+  # previously-defined key attempts to be set again.
+  #
+  #     foo = StaticHash.new
+  #     foo['name'] = 'Tom'    #=> 'Tom'
+  #     foo['age']  = 30       #=> 30
+  #     foo['name'] = 'Bob'
+  #
+  # produces
+  #
+  #     ArgumentError: Duplicate key for StaticHash -- 'name'
+  #
+  # StaticHash has it's orgins in Gavin Kistner's WriteOnceHash
+  # class found in his +basiclibrary.rb+ script.
+  #
+  # TODO: Maybe StaticHash isn't bets name for this class?
+  #
+  class StaticHash < CRUDHash
+
+    #
+    # Set a value for a key. Raises an error if that key already
+    # exists with a different value.
+    #
+    # key   - Index key to associate with value.
+    # value - Value to associate with key.
+    #
+    # Retruns value.
+    #
+    def store(key, value)
+      if key?(key) && fetch(key) != value
+        raise ArgumentError, "Duplicate key for StaticHash -- #{key.inspect}"
+      end
+      super(key, value)
+    end
+
+    #
+    #def update(hash)
+    #  dups = (keys | hash.keys)
+    #  if dups.empty?
+    #    super(hash)
+    #  else
+    #    raise ArgumentError, "Duplicate key for StaticHash -- #{dups.inspect}"
+    #  end
+    #end
+
+    #
+    #alias_method :merge!, :update
+
+  end
+
+end