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Using the justify feature (Ctrl+J) would insert hard line breaks, which made the text look disjointed in other editors. The following entries in /etc/nanorc should sort the issue:

set softwrap
set tabsize 4
set fill 90

I’ve tested whether this was soft wrapping by opening the test file in Vim and XWPE.

Other Things
There is also a spell checker, which I never actually use. Install aspell and uncomment the following in nanorc:
set speller aspell "aspell -x -c"

To show the cursor position at the foot of the editor:
set constantshow