Fix inconsistent handling of mixed nullable contexts · riok/mapperly@c986062

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Performance alert! Previous value was 120741.05671574519 and current value is 2088862.3680555555. It is 17.3003485713502x worse than previous exceeding a ratio threshold 3

Performance alert! Previous value was 1277208.939174107 and current value is 47443188.77575757. It is 37.14598866371557x worse than previous exceeding a ratio threshold 3