Log Message:
Update from version 1.19nb1 to 1.21.

Upstream changes:

1.21  2008-08-21  DCANTRELL  Extra tests added in 1.20 now skip with
                               really old JSON

1.20  2008-08-21  DCANTRELL  Added test for bug reported by Saritha
                               Nalagandla (no bug found, but you can never
                               have too many tests!)
                             Fixed bug in PERL5LIB splitting in taint test
                               (thanks to ADAMK, see RT 38319)