Surviving mutants

Generated by scripts/mutation_survivors.py from the cosmic-ray session databases. One row per surviving mutant: the suite ran that mutated line and no assertion failed.

A survivor is not automatically a bug — see the equivalent-mutant classes catalogued in docs/how-to/mutation-testing.md (type annotations, error-message f-strings, interpreter-detail rewrites). Triage means deciding, per row, whether the mutated behaviour is genuinely indistinguishable or whether nothing tests it.

40 surviving mutants across 1 modules, of which 0 are marked annot — a type annotation rewritten by a BitOr-family operator, which cannot change behaviour. Start with the unmarked rows.

src/pyrxd/fee_sizing.py — 40 survivors (0 annot)

Line	Definition	Operator	Original	Mutant
77	(module level)	AddNot	if TYPE_CHECKING:  # pragma: no cover - typing only	if not TYPE_CHECKING:  # pragma: no cover - typing only
115	(module level)	NumberReplacer	RADIANT_MIN_RELAY_PHOTONS_PER_KB = 1_000_000  # 0.01 RXD/kB (legacy floor)	RADIANT_MIN_RELAY_PHOTONS_PER_KB = 1000001  # 0.01 RXD/kB (legacy floor)
115	(module level)	NumberReplacer	RADIANT_MIN_RELAY_PHOTONS_PER_KB = 1_000_000  # 0.01 RXD/kB (legacy floor)	RADIANT_MIN_RELAY_PHOTONS_PER_KB = 999999  # 0.01 RXD/kB (legacy floor)
134	(module level)	NumberReplacer	WITNESS_SCALE_FACTOR = 4	WITNESS_SCALE_FACTOR = 3
134	(module level)	NumberReplacer	WITNESS_SCALE_FACTOR = 4	WITNESS_SCALE_FACTOR = 5
199	bitcoin_virtual_size	NumberReplacer	if not isinstance(value, int) or isinstance(value, bool) or value <= 0:	if not isinstance(value, int) or isinstance(value, bool) or value <= 1:
199	bitcoin_virtual_size	ReplaceOrWithAnd	if not isinstance(value, int) or isinstance(value, bool) or value <= 0:	if not isinstance(value, int) and isinstance(value, bool) or value <= 0:
223	fee_for_kb_rate	ReplaceComparisonOperator_LtE_Eq	if isinstance(per_kb, bool) or not isinstance(per_kb, int) or per_kb <= 0:	if isinstance(per_kb, bool) or not isinstance(per_kb, int) or per_kb == 0:
223	fee_for_kb_rate	ReplaceOrWithAnd	if isinstance(per_kb, bool) or not isinstance(per_kb, int) or per_kb <= 0:	if isinstance(per_kb, bool) and not isinstance(per_kb, int) or per_kb <= 0:
284	required_fee	ReplaceComparisonOperator_Lt_IsNot	if fee_rate < relay_floor_photons_per_byte():	if fee_rate is not relay_floor_photons_per_byte():
284	required_fee	ReplaceComparisonOperator_Lt_LtE	if fee_rate < relay_floor_photons_per_byte():	if fee_rate <= relay_floor_photons_per_byte():
284	required_fee	ReplaceComparisonOperator_Lt_NotEq	if fee_rate < relay_floor_photons_per_byte():	if fee_rate != relay_floor_photons_per_byte():
291	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_Div	*,	/,
323	assert_fee_rate_clears_relay_floor	NumberReplacer	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte * 999} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	NumberReplacer	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte * 1001} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_Add	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte + 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_BitAnd	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte & 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_BitOr	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte | 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_BitXor	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte ^ 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_Div	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte / 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_FloorDiv	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte // 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_LShift	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte << 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_Mod	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte % 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_Pow	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte ** 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_RShift	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte >> 1000} per kB), got {fee_rate}. A transaction built "
323	assert_fee_rate_clears_relay_floor	ReplaceBinaryOperator_Mul_Sub	f"{floor_per_byte * 1000} per kB), got {fee_rate}. A transaction built "	f"{floor_per_byte - 1000} per kB), got {fee_rate}. A transaction built "
336	fee_never_below_relay_floor	ReplaceBinaryOperator_Mul_BitAnd	return max(size_bytes * fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes	return max(size_bytes & fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes
336	fee_never_below_relay_floor	ReplaceBinaryOperator_Mul_Div	return max(size_bytes * fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes	return max(size_bytes / fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes
336	fee_never_below_relay_floor	ReplaceBinaryOperator_Mul_FloorDiv	return max(size_bytes * fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes	return max(size_bytes // fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes
336	fee_never_below_relay_floor	ReplaceBinaryOperator_Mul_Mod	return max(size_bytes * fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes	return max(size_bytes % fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes
336	fee_never_below_relay_floor	ReplaceBinaryOperator_Mul_RShift	return max(size_bytes * fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes	return max(size_bytes >> fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes
336	fee_never_below_relay_floor	ReplaceBinaryOperator_Mul_Sub	return max(size_bytes * fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes	return max(size_bytes - fee_rate, min_relay_fee(size_bytes))  # min_relay_fee validates size_bytes
345	trial_size_with_slack	ReplaceOrWithAnd	if isinstance(n_inputs, bool) or not isinstance(n_inputs, int) or n_inputs < 0:	if isinstance(n_inputs, bool) and not isinstance(n_inputs, int) or n_inputs < 0:
347	trial_size_with_slack	NumberReplacer	if isinstance(trial_size_bytes, bool) or not isinstance(trial_size_bytes, int) or trial_size_bytes <= 0:	if isinstance(trial_size_bytes, bool) or not isinstance(trial_size_bytes, int) or trial_size_bytes <= 1:
347	trial_size_with_slack	ReplaceComparisonOperator_LtE_Eq	if isinstance(trial_size_bytes, bool) or not isinstance(trial_size_bytes, int) or trial_size_bytes <= 0:	if isinstance(trial_size_bytes, bool) or not isinstance(trial_size_bytes, int) or trial_size_bytes == 0:
347	trial_size_with_slack	ReplaceOrWithAnd	if isinstance(trial_size_bytes, bool) or not isinstance(trial_size_bytes, int) or trial_size_bytes <= 0:	if isinstance(trial_size_bytes, bool) and not isinstance(trial_size_bytes, int) or trial_size_bytes <= 0:
435	fee_overpay_multiple	ReplaceBinaryOperator_Mul_Div	def fee_overpay_multiple(fee_photons: int, *, floor: int, target: int) -> float:	def fee_overpay_multiple(fee_photons: int, /, floor: int, target: int) -> float:
437	fee_overpay_multiple	NumberReplacer	requirement = max(int(floor), int(target), 1)	requirement = max(int(floor), int(target), 2)
437	fee_overpay_multiple	NumberReplacer	requirement = max(int(floor), int(target), 1)	requirement = max(int(floor), int(target), 0)
444	assert_tx_pays_for_itself	ReplaceBinaryOperator_Mul_Div	*,	/,