Fix inconsistent handling of mixed nullable contexts · riok/mapperly@4eca202

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Performance alert! Previous value was 120741.05671574519 and current value is 2112204.6041135206. It is 17.493673333389665x worse than previous exceeding a ratio threshold 3

Performance alert! Previous value was 1277208.939174107 and current value is 46025333.75324675. It is 36.03586879293886x worse than previous exceeding a ratio threshold 3