[R6RS] BOM-based codecs

[William D Clinger]

Mike wrote:
> I had previously forgotten to put the BOM codecs into the Ports I/O
> but have done so now.  Will, could you have a look to make sure it's
> what you wanted?

Now that transcoders are specified by operations,
I don't think the BOM codecs make much sense.
The better way is to use lookahead-char to get
the first character using the different transducers
you think are plausible, as in the example near
the end of srfi/io/performance.txt.

Will