Can not set parse or format to null with Flow

[11bit]

Are you submitting a bug report or a feature request?

Bug report

What is the current behavior?

Flow gives an error for form fields with parse or format set to null
Cannot create Field element because: • null [1] is incompatible with function type [2] in property parse.

What is the expected behavior?

No errors

What's your environment?

"react-final-form": "4.0.2",
"final-form": "4.11.0",
"flow-bin": "0.84",

Other information

Probably the fix is to slightly change type defs (it works in my project, but it has only one form so I am not sure about possible? side effects)

  format?: ((value: any, name: string) => any) | null,
  parse?: ((value: any, name: string) => any) | null,

[erikras]

Published fix in v6.0.0.

[lock]

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