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For 32-bit BOOL is a signed char, whereas under 64-bit it is a bool.
https://stackoverflow.com/questions/31267325/bool-with-64-bit-on-ios/31270249#31270249
Definition of BOOL from objc.h:
/// Type to represent a boolean value.
#if (TARGET_OS_IPHONE && __LP64__) || TARGET_OS_WATCH
#define OBJC_BOOL_IS_BOOL 1
typedef bool BOOL;
#else
#define OBJC_BOOL_IS_CHAR 1
typedef signed char BOOL;
// BOOL is explicitly signed so @encode(BOOL) == "c" rather than "C"
// even if -funsigned-char is used.
#endifFor 32-bit BOOL is a signed char, whereas under 64-bit it is a bool.
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