Release: 0.26.0 - Seqable Strings

Released Nov, 16 2025

String iteration + lazy file IO + more lazy seq functions + mocking framework + compiler optimizations

🎉 New Features

String Iteration & UTF-8 Support

Basic string iteration support (#1047)
Strings now work directly in foreach, count, frequencies, and all sequence functions
Sequence functions work directly on strings without explicit conversion
Added seq and phel\str/chars for explicitly converting strings to character vectors when needed
Full UTF-8 / multibyte iteration support

Lazy File & Directory Processing

Added partition-all for lazy partitioning with infinite sequence support (#1034)
Added line-seq for lazy line-by-line file reading with auto-cleanup (#1035)
Added file-seq for lazy recursive directory traversal (#1036)
Added read-file-lazy for lazy chunked file reading (#1037)
Added csv-seq for lazy CSV parsing (#1038)

More Fully Lazy Sequence Functions

concat (#1028)
interpose (#1029)
map-indexed (#1030)
interleave (#1031)
Variadic map (#1033)
partition (#1034)
Added lazy-seq and lazy-cat macros (#1043)

Core Library Improvements

Added mocking framework under phel\mock (#1042)
Added URL support to slurp (http/https/ftp) (#1040)
Added conj and deprecated push (#1046)
Added string index support to contains? (#1052)

✨ Developer Experience

Renamed collection args xs → coll for consistency (#1039)
Promoted assoc / dissoc, deprecated put / unset (#1041)
Improved docblocks across namespaces with examples (#1044)
Optimized compiler with multilevel caching (~25–35% faster, ~10% less memory) (#1045)

🐛 Bug Fixes

Fixed into for PersistentList and other ConcatInterface types lacking PushInterface
Fixed contains? to use character count instead of byte count for multibyte UTF-8 strings (#1053)
Prevent random failures in RunCommandTest with isolated cache (#1049)
Cleanup / rename generator classes (#1050)

Downloads

phel.phar (850.12 KB)

View release on GitHub