Changed the behavior of mrb_range_beg_len(); close #3411

The new API is:

int mrb_range_beg_len(mrb, range, &beg, &len, len, trunc)

The new argument `trunc` is a boolean value that specifies
whether the function truncates the range. The new return value
is an integer instead of a boolean, that is:

 0: not a range
 1: range with proper edges
 2: out of range

To get the old behavior, you have to rewrite:

  mrb_range_beg_len(mrb, range, &beg, &len, len)

to:

  mrn_range_beg_len(mrb, range, &beg, &len, len, TRUE) == 1

[Breaking Change]

1 files changed, 1 insertions, 1 deletions

diff --git a/mrbgems/mruby-kernel-ext/src/kernel.c b/mrbgems/mruby-kernel-ext/src/kernel.c
index 1aa40260e..7bb4dea68 100644
--- a/mrbgems/mruby-kernel-ext/src/kernel.c
+++ b/mrbgems/mruby-kernel-ext/src/kernel.c
@@ -22,7 +22,7 @@ mrb_f_caller(mrb_state *mrb, mrb_value self)
     case 1:
       if (mrb_type(v) == MRB_TT_RANGE) {
         mrb_int beg, len;
-        if (mrb_range_beg_len(mrb, v, &beg, &len, bt_len)) {
+        if (mrb_range_beg_len(mrb, v, &beg, &len, bt_len, TRUE) == 1) {
           lev = beg;
           n = len;
         }