Summary:
The bridge implementation on React Android does not currently support boxed numeric/boolean types (the equivalent of NSNumber arguments on iOS), nor does Java support Objective-C's nil messaging system that transparently casts nil to zero, false, etc for primitive types.
To avoid platform incompatibilities, we now treat all primitive arguments as non-nullable rather than silently converting NSNull -> nil -> 0/false.
We also now enforce that NSNumber * objects must be explicitly marked as `nonnull` (this restriction may be lifted in future if/when Android supports boxed numbers).
Other object types are still assumed to be nullable unless specifically annotated with `nonnull`.
Summary:
I am not 100% sure what causes reason to be null but it does happen.
Closes https://github.com/facebook/react-native/pull/1483
Github Author: Stanislav Vishnevskiy <vishnevskiy@gmail.com>
Test Plan: Imported from GitHub, without a `Test Plan:` line.
Nick Lockwood
Tadeu Zagallo
Stanislav Vishnevskiy
Harrison Harnisch