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12ec97f732
Resolves the last 16 mypy errors in the project (src/ocrmypdf and
tests are now fully clean).
fpdf_renderer/renderer.py (9 errors):
- add_page(format=...): fpdf2's own stub types this param as str, but
its docstring and get_page_format() helper confirm a (width, height)
tuple is accepted too - the stub annotation on add_page() itself is
the outlier. Used cast() to match the documented/actual behavior.
- pdf.current_font is typed CoreFont | TTFFont | None, but this
renderer only ever registers fonts via add_font() with a TTF file
(see _register_font/set_font call sites) - it never falls back to
fpdf2's built-in CoreFont. Added assertions (isinstance(font,
TTFFont) where shape_text()/escape_text() are needed, which
CoreFont lacks; plain not-None elsewhere) documenting that
invariant instead of narrowing defensively for a case that can't
happen here.
tests/test_pdf_renderer.py (7 errors): the ToUnicode/glyph-extraction
test helpers used `.get(key, {})` (a plain dict literal default) then
called `.values()`/`.items()` on the result. pikepdf.Object doesn't
declare `values()` in its stub (only `keys()`), so this silently
degraded to Object's catch-all `__getattr__` returning another Object,
which then failed as "not callable". Switched to `.get(key,
Dictionary()).as_dict()`, which returns pikepdf's properly-typed
_ObjectMapping helper.