Changes and additions:

• added enum-lambda to enumeration.ss;
• added "let loop" form to let/debug;
• added date.ss, which wraps bzlib/date.plt and bzlib/date-tz.plt to provide a set of time-zone- / daylight-saving-aware date functions.

• renamed generator-fold to generator-fold-map;
• renamed generator-accumulate to generator-fold;
• renamed g:fold to g:fold-map;
• renamed g:accumulate to g:fold;
• finalised and documented generator-project and g:project.

• Added define-stage for defining pipeline stages.
• Removed raise-exn/format and raise-exn/append.

Changes and additions:

• added optional #:equality-test argument to define-enum form in enumeration.ss, paving the way for string enumerations;
• added date-days-difference, date-weeks-difference, date-months-difference, and date-years-difference to date.ss;
• added round-to to number.ss;
• added natural->hex-string and hex-string->natural to number.ss and string.ss;
• documentation fixes (thanks to Eric Hanchrow for spotting these).

Changes and additions:

• added enum-lambda to enumeration.ss;
• added "let loop" form to let/debug;
• added date.ss, which wraps bzlib/date.plt and bzlib/date-tz.plt to provide a set of time-zone- / daylight-saving-aware date functions.

Changes and additions:

• bug fix to eq? and equal? in match.ss.

Changes and additions:

• added enum-complement macro to enumeration.ss;
• fixed bug related to misuse of define-match-expander in match.ss.

Changes and additions:

• fixed bug in time->date.

Changes and additions:

• fixed infinite loop when parsing some badly formed define-enum statements;
• added in-enum and in-enum/pretty forms to enumeration.ss;
• added enum-value/c to enumeration.ss and enum.ss;
• added generator-append and g:append.

Changes and additions:

• added for.ss containing several useful for variants;
• added enumeration.ss, containing a new version of enum.ss;
• added list-diff to list.ss;
• added optional #:short? argument to time->ago-string and seconds->ago-string.

Changes and additions:

• added dotted-identifier?, simple-dotted-identifier?, dotted-identifier-count and dotted-identifier-split.
• added optional #:format argument to control the text formatting in time->ago-string and seconds->ago-string;
• added file-pretty-size and prettify-file-size;
• added crc.ss and crc32.

Changes and additions:

• added string-length/c.

Changes and additions:

• simplified the syntaxes produced by define-library-aliases;
• added list-ref? to list.ss;
• added slash-style aliases for various debug forms (let/debug and so on; the old hyphen-style aliases will be removed in a future version of Unlib);
• documented forthcoming backwards-incompatible changes in Unlib 4.

Changes and additions:

• added define-library-aliases to require.ss;
• added documentation for require.ss.

Changes and additions:

• added keyword-apply* macro in keyword.ss.

Changes and additions:

• added keyword-apply* macro in keyword.ss.

Changes and additions:

• added define-values-debug, let-values-debug, let*-values-debug, letrec-values-debug, debug-in and debug-out;
• added unzip-values procedure in list.ss;
• added path-contains? procedure in file.ss;
• added match.ss containing eq? and equal? patterns for use with the scheme/match library;
• added optional separator argument to enum->string and enum->pretty-string;
• removed stage, find-stage and define-stage;
• unit tests ported to SchemeUnit 3.

This update provides a number of new features, including some backwards-incompatible changes to logging to add compatibility with the logging functions introduced as part of PLT 4.1:

• added generator->hash and its shorter alias, g:collect/hash;
• added string-ellipsify;
• added enumerations as a awy of defining symbolic enumerations with less risk of misspellings;
• revised log.ss to make it compatible with the built-in logging in PLT.

make-yieldable is now implemented using composable continuations.

• added copy-date to time.ss;
• added make-list* and in-list/cycle to list.ss;
• added optional key comparison argument to alist-set in list.ss;
• added url-remove-params, url-path-only and url-local to url.ss;