[plt-scheme] #!r6rs braces

The default value of print-mpair-curly-braces is #t. For scheme and scheme/base this is the right default, I think. For #!r6rs, however, I would welcome the default to be #f.

What are your opinions about this?

Of course I can set print-mpair-curly-braces to #f myself, but this means that I have to import a non standard procedure or module. For me the main reason of using #!r6rs is to produce code that runs an every R6RS conformant compiler/interpreter. When this conformance is not required I prefer to use the more comprehensive #lang scheme.

Jos
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