1 files changed, 16 insertions, 2 deletions
diff --git a/range.c b/range.c
index d44f322ab0..54c7d88301 100644
--- a/range.c
+++ b/range.c
@@ -331,6 +331,21 @@ discrete_object_p(VALUE obj)
     return rb_respond_to(obj, id_succ);
 }
 
+static int
+linear_object_p(VALUE obj)
+{
+    if (FIXNUM_P(obj) || FLONUM_P(obj)) return TRUE;
+    if (SPECIAL_CONST_P(obj)) return FALSE;
+    switch (BUILTIN_TYPE(obj)) {
+      case T_FLOAT:
+      case T_BIGNUM:
+	return TRUE;
+    }
+    if (rb_obj_is_kind_of(obj, rb_cNumeric)) return TRUE;
+    if (rb_obj_is_kind_of(obj, rb_cTime)) return TRUE;
+    return FALSE;
+}
+
 static VALUE
 range_step_size(VALUE range, VALUE args, VALUE eobj)
 {
@@ -1156,8 +1171,7 @@ range_include(VALUE range, VALUE val)
     VALUE beg = RANGE_BEG(range);
     VALUE end = RANGE_END(range);
     int nv = FIXNUM_P(beg) || FIXNUM_P(end) ||
-	     rb_obj_is_kind_of(beg, rb_cNumeric) ||
-	     rb_obj_is_kind_of(end, rb_cNumeric);
+	     linear_object_p(beg) || linear_object_p(end);
 
     if (nv ||
 	!NIL_P(rb_check_to_integer(beg, "to_int")) ||