Is it guaranteed for GcHandle.ToIntPtr not to return zero for non-null values?

[anatawa12]

I could not find documentation that express this but is it guaranteed?
If so, could you document?

[huoyaoyuan]

runtime/src/libraries/System.Private.CoreLib/src/System/Runtime/InteropServices/GCHandle.cs

Line 146 in 300013b

public readonly bool IsAllocated => _handle != 0;

It's somehow a common contract of "handle": 0 value always means equivalent of null.

[anatawa12]

I found similar codes in the GCHandle struct but I could not believe it's not a implementation details.

[huoyaoyuan]

In my mind, it's too common beyond GCHandle. It's applicable for any handle.