The DupEncodingIntRep() routine is broken. It fails to set the typePtr

field of the duplicated Tcl_Obj to indicate that the intrep is that of
the &encodingType.  The impact must be that refcounting of Tcl_Encodings
are out of balance, at least in the (unusual?) case where "encoding" values
need duplication.  I hesitate to actually commit this fix until I have a
test demonstrating the need for it, and a chance to see the impact on
actual encoding operations.  The lifetime management of encodings has a
history of being tricky and raising controversy.  More work required.

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