Add RARRAY_LEN and RARRAY_CONST_PTR

Author: sue445

ruby/ruby_internal_core_rarray.go

@@ -0,0 +1,18 @@
+package ruby
+
+/*
+#include "ruby.h"
+*/
+import "C"
+
+// c.f. https://github.com/ruby/ruby/blob/master/include/ruby/internal/core/rarray.h
+
+// RARRAY_LEN is alias to [RbArrayLen]
+func RARRAY_LEN(a VALUE) Long {
+	return RbArrayLen(a)
+}
+
+// RARRAY_CONST_PTR is alias to [RbArrayConstPtr]
+func RARRAY_CONST_PTR(a VALUE) *VALUE {
+	return RbArrayConstPtr(a)
+}