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6900505b05
As of 041d8b48a2
it’s not valid to call `random.choices` without giving at least one of
the options a positive weighting.
This makes sense, because giving a zero weighting is effectively saying
‘theres’s only one choice, but don’t choose it’.
In our codebase this is applicable where there’s only one international
provider, which we want to use even when it’s been de-prioritised for
domestic SMS.
This doesn’t cause a problem now, but will if we upgrade to Python
versions greater than 3.9.0.