As part of this, I noticed a problem when updating the Rust
implementation. With the BF..84 design for annotations, if you are
wanting to skip annotations—for example, if you're parsing
incrementally, SAX-style, ignoring annotations—then with any
parenthesised form you have to remember to check for and skip something
after reading a term. This is awkward, so I want to revisit the design
of annotations and go back to the prefix-form (85..) of the
current-mainline design.
Numbers and (bare) Symbols are now disambiguated after reading, which
permits leading `+`, leading `0`, and a wider range of acceptable
Symbols.
Updates spec text, test cases, and implementations. Some ancillary fixes
to Python's comparison routines are also included.
Tony Garnock-Jones