TIP 746 (Tcl 9.1) removed lseq's expr-operand behaviour. punk::lib::range
(lseq branch) now normalizes int[+-]int offsets via offset_expr so callers
like `range 0 [llength $list]-1` keep working (punk::ansi::grepstr broke
under 9.1b0, taking example-block highlighting and the punk::args
examples.test with it). The lseq branch is also aligned with the tcl8
fallback contract: default 'by' now infers direction (descending ranges
previously returned empty under tcl9) and 'by 0' returns empty (Tcl 9.1
lseq changed by-0 to return one element).
Direct lseq expression operands expr-wrapped: punk::lib lzipn_tcl9b/c,
cols, cols2; punk::args zero_based_posns.
check::has_tclbug_safeinterp_compile falls back to interp invokehidden
tcl:unsupported:disassemble - Tcl 9.1 safe interps hide tcl::unsupported::*.
New modules/punk/lib range.test pins the range contract on 9.0 and 9.1;
core tests AGENTS.md documents native-tclsh vs punk-exe exec.test baselines.
Assisted-by: harness=claude; primary-model=claude-fable-5; api-location=anthropic.com
Julian Noble