I've just published draft #4 of SRFI 196. It was submitted by John Cowan, co-author of the SRFI.

Here are John's comments on the draft:

finalization draft

Here is the commit summary:

• Fix bug in range-take/drop procedures: don't touch lower bounds.
• Add tests for a pseudo numeric range.
• Remove unneeded let.
• indexer constraint
• Revert "Remove unneeded let."
• Revert "Add tests for a pseudo numeric range."
• Revert "Fix bug in range-take/drop procedures: don't touch lower bounds."
• Use no-check procedures and macros internally throughout.
• subrange
• shares the same element comparator
• Add subrange.
• Add tests for element comparator equivalence.
• Fix off-by-one error in range-index-right.
• Additional tests.
• Remove non-SRFI-78-compatible test syntax.
• Minor editorial. Fix typos and kill trailing whitespace.
• copy edits
• Additional copy edits.
• indexer -> ind
• MN-W review before finalization
• numeric-range: Additional checks.
• Don't touch lower bounds.
• subrange: Use an indexer offset, as in range-drop.
• editorial
• remove comparator, -contains?, and -includes
• Revert "subrange: Use an indexer offset, as in range-drop."
• Revert "Don't touch lower bounds."
• Remove comparators and predicates.
• SRFI 42 recommendation
• link to Python ranges
• Add link to John's Github repo.
• Add preview link.
• Fix link.
• remove need for end of a numeric range to be exact
• Fix errors reported by W3C HTML Validator.
• Publish fourth draft.

Here's the diff:

https://github.com/scheme-requests-for-implementation/srfi-196/compare/draft-3..draft-4

Regards,


SRFI Editor