Manu's `shared` vs the @trusted promise

[Nicholas Wilson]

On Monday, 22 October 2018 at 11:24:27 UTC, Dukc wrote:
> Frankly, this does not sound credible. According to this 
> rationale, array access should be @system too, because it 
> relies on the array not giving direct access to its length to 
> the user, which would also in itself be @safe.

For reading, its a size_t so can be done with atomics, writing 
OTOH is a @property that calls a function to reallocate if ned 
be. Reallocation obviously needs to be locked.