Fix an off-by-one error in the rb_numparam_id_p

[Bug #21356]

Co-Authored-By: Richard Böhme <richard.boehme1999@gmail.com>

Author: mame

proc.c

@@ -507,7 +507,7 @@ bind_local_variables(VALUE bindval)
 int
 rb_numparam_id_p(ID id)
 {
-    return (tNUMPARAM_1 << ID_SCOPE_SHIFT) <= id && id < ((tNUMPARAM_1 + 10) << ID_SCOPE_SHIFT);
+    return (tNUMPARAM_1 << ID_SCOPE_SHIFT) <= id && id < ((tNUMPARAM_1 + 9) << ID_SCOPE_SHIFT);
 }
 
 /*

test/ruby/test_proc.rb

@@ -1599,14 +1599,14 @@ def test_overridden_proc
     assert_normal_exit('def proc; end; ->{}.curry', bug8345)
   end
 
-  def get_binding if: 1, case: 2, when: 3, begin: 4, end: 5
+  def get_binding if: 1, case: 2, when: 3, begin: 4, end: 5, default: 6
     a ||= 0
     binding
   end
 
   def test_local_variables
     b = get_binding
-    assert_equal(%i'if case when begin end a', b.local_variables)
+    assert_equal(%i'if case when begin end default a', b.local_variables)
     a = tap {|;x, y| x = y = x; break binding.local_variables}
     assert_equal(%i[a b x y], a.sort)
   end
@@ -1637,6 +1637,7 @@ def test_local_variable_get
     assert_equal(3, b.local_variable_get(:when))
     assert_equal(4, b.local_variable_get(:begin))
     assert_equal(5, b.local_variable_get(:end))
+    assert_equal(6, b.local_variable_get(:default)) # [Bug #21356]
   end
 
   def test_local_variable_set