HCORENUM passed as int not ptr

[Descolada]

If I understand correctly then rtmetadata.ahk line 213 calls IMetaDataImport::CloseEnum which expects a pointer-sized HCORENUM hEnum, so that line should be args.__delete := args => ComCall(3, this, "ptr", henum, "int") instead. Passing it as "int" was causing me memory read-write errors in x64.

[Lexikos]

You are correct that it should be "ptr", but it is not possible that the use of "uint" was the cause of memory read-write errors.

The reason is that for integer input parameters on x64, DllCall never truncates the value; it always passes the entire 64 bits in the corresponding register or stack slot. On x86, the value is truncated to exactly 32 bits unless it is int64. It goes from token to DYNAPARM, through DynaParamToElement, and into regArgs or stackArgs, which is the exact data for the parameter list.