Merge pull request rmosolgo#4319 from rmosolgo/name-encoding

Introspection performance: encode names in UTF-8

Author: rmosolgo

lib/graphql/schema/field.rb

@@ -229,6 +229,7 @@ def initialize(type: nil, name: nil, owner: nil, null: nil, description: :not_gi
         end
         @original_name = name
         name_s = -name.to_s
+
         @underscored_name = -Member::BuildType.underscore(name_s)
         @name = -(camelize ? Member::BuildType.camelize(name_s) : name_s)
         if description != :not_given

lib/graphql/types/string.rb

@@ -7,7 +7,7 @@ class String < GraphQL::Schema::Scalar
 
       def self.coerce_result(value, ctx)
         str = value.to_s
-        if str.encoding == Encoding::UTF_8
+        if str.ascii_only? || str.encoding == Encoding::UTF_8
           str
         elsif str.frozen?
           str.encode(Encoding::UTF_8)