Update generator to correctly handle int64/uint64 types as fixnum/bignum instead of strings

lib/google/apis/generator/model.rb

@@ -51,6 +51,8 @@ module Google
           when 'string', 'boolean', 'number', 'integer', 'any'
             return 'DateTime' if format == 'date-time'
             return 'Date' if format == 'date'
+            return 'Fixnum' if format == 'int64'
+            return 'Fixnum' if format == 'uint64'
             return TYPE_MAP[type]
           when 'array'
             return sprintf('Array<%s>', items.generated_type)

lib/google/apis/generator/templates/_representation.tmpl

@@ -33,7 +33,7 @@ class <%= cls.generated_class_name %>
 <%       elsif property.type == 'array' -%>
     collection :<%= property.generated_name %>, as: '<%= property.name %>'<%= include('representation_type', :lead => ', ', :type => property.items, :api => api) %>
 <%       else -%>
-    property :<%= property.generated_name %>,<% if property.format == 'byte' %> :base64 => true,<%end%> as: '<%= property.name %>'<%= include('representation_type', :lead => ', ', :type => property, :api => api) %>
+    property :<%= property.generated_name %>,<% if ['uint64', 'int64'].include?(property.format) %> :numeric_string => true,<%end%><% if property.format == 'byte' %> :base64 => true,<%end%> as: '<%= property.name %>'<%= include('representation_type', :lead => ', ', :type => property, :api => api) %>
 <%       end -%>
 <%     end -%>
 <%   end -%>