chore: add comment and additional parallel stand-in option

Author: jenstroeger

pyproject.toml

@@ -133,6 +133,7 @@ mypy_path = [
     "src/",
 ]
 explicit_package_bases = true
+num_workers = 2
 show_error_codes = true
 show_column_numbers = true
 pretty = true
@@ -152,7 +153,7 @@ disallow_incomplete_defs = true
 disallow_untyped_decorators = true
 # disable_error_code =
 # allow_redefinition =
-no_sqlite_cache = true
+no_sqlite_cache = true  # https://github.com/python/mypy/issues/21769
 
 # https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
 [[tool.mypy.overrides]]