from . import MyMod lowercases; import pkg.MyMod does not

Measured 2026-09-11, compiler c53cb51926a2. One package, one file pkg/MyMod.py containing VAL = 7, three spellings:

The asymmetry is the finding, not the failure. The absolute door preserves case and the relative door folds it, so the two doors disagree about what a module is called. A reader who hits the relative arm sees a missing-module error naming a file that is right there on disk with different capitalisation, and the message reports the folded name, which is what makes it puzzling rather than obvious.

Pascal is case-insensitive and pxx units are looked up accordingly, so folding is presumably deliberate somewhere in the unit path. That is why this is a ticket rather than a fix: whether NilPy module names should be case-sensitive is a policy question about where the Python surface stops and the Pascal unit table starts, and decide-own-language-first-vs-explicit-import-in-a-case-insensitive-language (decided) is about a different question — precedence, not spelling — so it does not settle this one.

Not the same as the third row. from pkg import MyMod failing with no unit named pkg is the absolute-package-import gap, unrelated to case; it fails identically for an all-lowercase module name. It is mentioned only so a fixer does not read this ticket as covering it. Nearest relative: [[bug-n-from-package-import-submodule-binds-the-parent-package]], which is about a real package binding the PARENT and is also not this.

Same mechanism, different surface: [[bug-n-a-c-header-import-lowercases-the-library-name-so-gl-does-not-link]] is the C-header path folding a library name. Worth fixing together if the fold turns out to be one helper; worth knowing about either way, because a fixer who finds the fold site will be looking at both callers.

Prio 35 and the reason is exposure, not severity: it is a loud compile error, never a silent wrong value, and no module in the lekkerzeilen corpus has a capital in its name, so it blocks nothing ranked today. It will bite the first corpus that ships a CamelCase.py, which in Python is common enough for class-per-module layouts.