Summary:
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This PR resolves a warning `Implicit conversion loses floating-point precision: 'double' to 'CGFloat' (aka 'float')` when building not only this library **but also apps** for 32bit devices since it's declared in public header file.
Pull Request resolved: https://github.com/facebook/react-native/pull/19416
Differential Revision: D14206633
Pulled By: cpojer
fbshipit-source-id: a65a4774235fa7fb24fac2f9bf7e51ba2a027377