The server selection spec states the following:
To always select the server with the lowest RTT, users should use mode 'nearest' without tag_sets or maxStalenessSeconds and set localThresholdMS to zero.
mongoc_topology_new() initializes its copy of localThresholdMS by calling mongoc_uri_get_option_as_int32(). which does not respect a zero value and instead returns the fallback of 15ms (as documented).
One solution may be to create a separate getter that respects zero, as was done with _mongoc_uri_get_max_staleness_option().
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PHPC-918 localThresholdMS of zero is not supported
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