[wynneyin]

Related to #214.

Comparing event headers with None, an integer or an ordinary sentinel currently raises TypeError. Comparing them with unittest.mock.ANY also raises before the other operand can handle the comparison.

Return NotImplemented when the operand's type supports neither the iterator protocol nor the legacy __getitem__ sequence protocol. Otherwise retain the existing content comparison. This preserves iterable comparisons and exceptions from both iterator initialization and consumption.

Regression tests cover equality and inequality in both operand orders, reflected comparison with ANY, existing lists/tuples/iterators/header objects, legacy sequences, and iterator setup/consumption errors. AI-assisted contribution with an independent read-only review; the review's iterator-setup finding was reproduced and corrected.

Validation on macOS arm64:

• Original implementation: 4 failed, 6 passed in the initial focused suite.
• Final implementation: 86 passed on each of Python 3.10.19, 3.11.14, 3.12.7, 3.13.9 and 3.14.0.
• Full Black and isort checks pass; strict mypy passes across 22 source files.
• Original suite: 78 passed, statement/branch coverage 98.2%. Final suite: 86 passed, coverage 98.2%, with the same 19 uncovered statements and all added branches covered. The baseline run deselected the new tests and used the original production implementation.
• git diff --check passes.
• Python 3.8, 3.9 and PyPy were not tested locally.

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