The standing of permanent residents in the civil service

I thought a part of the Cayman Islands Constitution included protections so that government could not discriminate on the basis of race or nationality? If that is the case, why are people with permanent residence still regarded as expats within the civil service? Even if a person with PR is already employed within government, Caymanians are sought to replace them, whereas in the private sector, Caymanians, PRs and status holders are treated as being on the same level with respect to employment eligibility.

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