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def
func:isMetric
isMetric(val: null)
Given an optional value return true if the SI metric system should be used. Return false if the United States customary unit system should be used. The following rules are used:
- if val is a dict with 
geoCountryreturn return false if "US" - if number or rec with 
unitand unit is known to be a US customary unit return false (right now we only check for °F and Δ°F) - fallback to locale of hosting server, see 
Locale 
Examples:
isMetric({geoCountry:"US"})  >>  false
isMetric({geoCountry:"FR"})  >>  true
isMetric(75°F)               >>  false
isMetric({unit:"Δ°C"})       >>  true
isMetric()                   >>  fallback to server locale