1 files changed, 7 insertions, 6 deletions

diff --git a/ext/json/ext/parser.rl b/ext/json/ext/parser.rl
index b91ac00..f09c66d 100644
--- a/ext/json/ext/parser.rl
+++ b/ext/json/ext/parser.rl
@@ -77,7 +77,7 @@ static VALUE mJSON, mExt, cParser, eParserError, eNestingError;
 static VALUE CNaN, CInfinity, CMinusInfinity;
 
 static ID i_json_creatable_p, i_json_create, i_create_id, i_create_additions,
-          i_chr, i_max_nesting, i_allow_nan, i_object_class, i_array_class;
+          i_chr, i_max_nesting, i_allow_nan, i_object_class, i_array_class, i_key_p;
 
 %%{
     machine JSON_common;
@@ -609,7 +609,7 @@ static VALUE cParser_initialize(int argc, VALUE *argv, VALUE self)
             rb_raise(rb_eArgError, "opts needs to be like a hash");
         } else {
             VALUE tmp = ID2SYM(i_max_nesting);
-            if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
+            if (option_given_p(opts, tmp)) {
                 VALUE max_nesting = rb_hash_aref(opts, tmp);
                 if (RTEST(max_nesting)) {
                     Check_Type(max_nesting, T_FIXNUM);
@@ -621,14 +621,14 @@ static VALUE cParser_initialize(int argc, VALUE *argv, VALUE self)
                 json->max_nesting = 19;
             }
             tmp = ID2SYM(i_allow_nan);
-            if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
+            if (option_given_p(opts, tmp)) {
                 VALUE allow_nan = rb_hash_aref(opts, tmp);
                 json->allow_nan = RTEST(allow_nan) ? 1 : 0;
             } else {
                 json->allow_nan = 0;
             }
             tmp = ID2SYM(i_create_additions);
-            if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
+            if (option_given_p(opts, tmp)) {
                 VALUE create_additions = rb_hash_aref(opts, tmp);
                 if (RTEST(create_additions)) {
                     json->create_id = rb_funcall(mJSON, i_create_id, 0);
@@ -639,13 +639,13 @@ static VALUE cParser_initialize(int argc, VALUE *argv, VALUE self)
                 json->create_id = rb_funcall(mJSON, i_create_id, 0);
             }
             tmp = ID2SYM(i_object_class);
-            if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
+            if (option_given_p(opts, tmp)) {
                 json->object_class = rb_hash_aref(opts, tmp);
             } else {
                 json->object_class = Qnil;
             }
             tmp = ID2SYM(i_array_class);
-            if (st_lookup(RHASH_TBL(opts), tmp, 0)) {
+            if (option_given_p(opts, tmp)) {
                 json->array_class = rb_hash_aref(opts, tmp);
             } else {
                 json->array_class = Qnil;
@@ -754,6 +754,7 @@ void Init_parser()
     i_allow_nan = rb_intern("allow_nan");
     i_object_class = rb_intern("object_class");
     i_array_class = rb_intern("array_class");
+    i_key_p = rb_intern("key?");
 #ifdef HAVE_RUBY_ENCODING_H
     CEncoding_UTF_8 = rb_funcall(rb_path2class("Encoding"), rb_intern("find"), 1, rb_str_new2("utf-8"));
     CEncoding_UTF_16BE = rb_funcall(rb_path2class("Encoding"), rb_intern("find"), 1, rb_str_new2("utf-16be"));