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ExecutionTxContext
a new type (instead of alias) which holds slices instead of pointers and lengthsinput
andcode
fields ofExecutionMessage
fromOption<Vec<u8>>
toOption<&[u8]>
thereby eliminating allocationsalloc
anddealloc
directly but convert between*mut T, usize
andBox<[T]>
into_ffi_pointer
safe as there is no unsafe operation involved