* hash.c (rb_hash_dup): should preserve HASH_PROC_DEFAULT and
HASH_DELETED flags.
* hash.c (rb_hash_shift): shift from empty hash should not return
its default proc.
* hash.c (rb_hash_default_proc): new method. [new]
* array.c (rb_ary_aref): no need for Bignum check.
* array.c (rb_ary_aset): explicit Bignum check removd.
* numeric.c (fix_aref): normalize bignum before bit-op.
* bignum.c (rb_big_rand): max may be Bignum zero.
* bignum.c (rb_cstr_to_inum): should normalize bignums, to avoid
returning fixable bignum value.
* bignum.c (rb_uint2big): there should be no zero sized bignum.
* ext/extmk.rb.in: extmake() that works properly for both tkutil
(tk/tkutil.so) and digest/sha1.
* hash.c (rb_hash_equal): should check HASH_PROC_DEFAULT too.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@2706 b2dd03c8-39d4-4d8f-98ff-823fe69b080e