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persistent-bug's Introduction

Investigating a potential persistent bug with <-. on nullable fields.

$ cabal run
…
people that match filters: []
[Person {personName = "John Doe", personAge = Just 35},Person {personName = "Jane Doe", personAge = Nothing}]
people that match filters: [PersonAge <-. [Nothing,Just 35]]
[Person {personName = "John Doe", personAge = Just 35},Person {personName = "Jane Doe", personAge = Nothing}]
people that match filters: [PersonAge <-. [Just 35]]
[Person {personName = "John Doe", personAge = Just 35}]
people that match filters: [PersonAge <-. [Nothing]]
[]

I would have expected Person {personName = "Jane Doe", personAge = Nothing} to match filters [PersonAge <-. [Nothing]].

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