FAST UNSAFE
自从 3.12
FAST UNSAFE
UNSAFE 关键字与
FAST 一起使用，允许即时编译器使用不安全但速度更快的代码。
使用该关键字会产生以下效果：
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Conversion from Float to Single does not check for overflow.
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Public object variables are accessed without checking if the object reference is null, or if the object is invalid.
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Array access does not check for index validity.
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Division by zero is not checked.
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Bit access functions do not check the bit index.
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Mathematical functions result validity is not checked.
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Memory access functions do not check for illegal memory access.
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Arithmetic overflows are ignored.
因此，不正确的代码使用
UNSAFE 关键字编译通常会导致解释器崩溃，或者充其量是不确定的行为。
See also