[OSM-talk] Nominatim - Does it use the is_in tag?

[Dave F]

Hi

I've heard a claim from a user who still wants to use the is_in:* tag as 
well as boundary tags that Nominatim uses is_in as preference because 
"geospacial mathematics is resource intensive".

Is this true?

I thought geospacial calculations were fairly light on processing power.

I also thought is_in:* was to be discouraged. Being hard coding, if a 
boundary was to change all affected entities would become inaccurate.

Thanks
Dave F.