A DESCRIPTION OF THE REQUEST :
In class Charset a small cache of size 2 is implemented.
I suggest to increase the size to 3.

JUSTIFICATION :
In debugging sessions I have found out, that usage of 3 charsets at same time is usual case.
On my system, "UTF-8" and "windows-1252" are often alternately used from system request. If user requests an additional charset, the charsets are alternately thrown out of this cache.