Log Message:
Update from version 2.231 to 2.232.

Upstream changes:

2.232 Sun Feb 22 11:12:25 CET 2009
	- use an exponential algorithm to extend strings, to
          help platforms with bad or abysmal==windows memory
          allocater performance, at the expense of some memory
          wastage (use shrink to recover this extra memory).
          (nicely analysed by Dmitry Karasik).

2.2311 Thu Feb 19 02:12:54 CET 2009
        - add a section "JSON and ECMAscript" to explain some
          incompatibilities between the two (problem was noted by
          various people).
	- add t/20_faihu.t.