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`cond` `=>` with guard as well as generator (see #89): [http://srfi.schemers.org/srfi-61/srfi-61.html SRFI 61]
Evaluator arguments to procedures like `load`: see #277
Extended exact numbers: ExtendedRationalsCowan
`if` with arbitrarily many arguments: [http://dpk.io/r7rs/naryif-20130406 David Kendal's rationale]
Multiple values passed through => in `cond`: see #90
`number->string` and `string->number` with non-ASCII decimal digits: NumberStringUnicode
Raw strings: <<, """...""", [http://srfi.schemers.org/srfi-109/srfi-109.html SRFI 109]
String positions and slices: [http://www.r6rs.org/formal-comments/comment-235.txt R6RS formal comment #235]
Undefined value API: see #49