The paradigm of a residence is much more fluid than many people think.

I used to work on boats. For income tax purposes I was a BVI resident, for immigration purposes I was a US resident since I didn't have a residence permit in the BVI (not necessary for boat crew), for the purpose of immigration establishing a relationship with my future wife we did not - by their judgment - live together, or even in the same country (despite sharing a cabin with ~10 sq. ft. of floor space), for the purposes of voter registration I was a Colorado resident.

Depending on which government and agency within that government you ask, I could be a US resident (Colorado sec. of state), while not being a US resident (IRS), while being a US resident (US CBP), while not being a resident of the country I was physically living and working in (BVI), while living in a different country than my wife who I was never more than 100 ft. from (CBSA).

The actual foreign address accepted by the IRS, and Canadian immigration authorities (slightly anonymized): [BOAT_NAME],Bob's dock, East End, Tortola, BVI.

Residence is far more complicated for many people than the standard government mold assumes.