float ranges

float_range.patch

diff --git a/range.c b/range.c
index ebd0811..8cb4da8 100644
--- a/range.c
+++ b/range.c
@@ -419,11 +419,21 @@ range_step(int argc, VALUE *argv, VALUE range)
        if (!rb_obj_is_kind_of(step, rb_cNumeric)) {
            step = rb_to_int(step);
        }
-       if (rb_funcall(step, '<', 1, INT2FIX(0))) {
-           rb_raise(rb_eArgError, "step can't be negative");
+       if (rb_funcall(b, '>', 1, e)) {
+           if (rb_funcall(step, '>', 1, INT2FIX(0))) {
+               rb_raise(rb_eArgError, "step can't be positive for a reverse range");
+           }
+           else if (!rb_funcall(step, '<', 1, INT2FIX(0))) {
+               rb_raise(rb_eArgError, "step can't be 0");
+           }
        }
-       else if (!rb_funcall(step, '>', 1, INT2FIX(0))) {
-           rb_raise(rb_eArgError, "step can't be 0");
+       else {
+           if (rb_funcall(step, '<', 1, INT2FIX(0))) {
+               rb_raise(rb_eArgError, "step can't be negative");
+           }
+           else if (!rb_funcall(step, '>', 1, INT2FIX(0))) {
+               rb_raise(rb_eArgError, "step can't be 0");
+           }
        }
     }

float_range_2.0

$ ruby -ve '(1.0..2.0).step(0.1){|f| p f }'
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-linux]
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7000000000000002
1.8
1.9
2.0
$ ruby -ve '(2.0..1.0).step(-0.1){|f| p f }'
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-linux]
-e:1:in `step': step can't be negative (ArgumentError)
	from -e:1:in `<main>'
$ 

float_range_patched

$ ruby21 -ve '(1.0..2.0).step(0.1){|f| p f }'
ruby 2.1.0dev (2013-11-06 trunk 43545) [x86_64-linux]
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7000000000000002
1.8
1.9
2.0
$ ruby21 -ve '(1.0..2.0).step(-0.1){|f| p f }'
ruby 2.1.0dev (2013-11-06 trunk 43545) [x86_64-linux]
-e:1:in `step': step can't be negative (ArgumentError)
	from -e:1:in `<main>'
$ ruby21 -ve '(2.0..1.0).step(-0.1){|f| p f }'
ruby 2.1.0dev (2013-11-06 trunk 43545) [x86_64-linux]
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.2999999999999998
1.2
1.1
1.0
$ ruby21 -ve '(2.0..1.0).step(0.1){|f| p f }'
ruby 2.1.0dev (2013-11-06 trunk 43545) [x86_64-linux]
-e:1:in `step': step can't be positive for a reverse range (ArgumentError)
	from -e:1:in `<main>'
$