[plt-scheme] supported character set conversions in PLT 4.x on Linux

If my application runs on Linux, can I be reasonably confident that, in 
future PLT 4.x versions, "bytes-open-converter" will support all the 
encodings of "iconv_open"?

And furthermore that future versions will support all the encoding names 
of "iconv_open" (e.g., will support the name "CP1252" as meaning the 
Windows-1252 encoding)?

http://www.gnu.org/software/libiconv/documentation/libiconv/iconv_open.3.html

Thanks.

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