TextInput font family incorrect after switching secureTextEntry off

[jevakallio]

RN 0.19 on iOS.

I am implementing a component that allows user to see their password in plain text by pressing a button:

I would expect the font of the text input to be as defined by the style sheet

Instead, the font family of the characters is a default serif font:

I am able to work around this by forcing the TextInput to re-render by setting a new key prop, but this causes the input to lose focus and keyboard to withdraw.

[facebook-github-bot]

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[johnnynanjiang]

I have the same problem, even when re-rendering the page.

[christopherdro]

Duplicate #6149