file-persistent settings plugin ?

Is this possible, such hypothetic plugin:
"file-persistent settings":
the plugin would save (automatically) and restore (automatically)
settings per file-name(pathname). Namely, those settings that were
different from default vim settings (or from global vim settings).
By analogy with "persistent line-numbers" (.viminfo), this
must be possible, because.viminfo does something similar.

For example. My "set nu" is normally off.
Let's say I do "set nu" on buffr ~/hello.c.
Then I quit vim, then restart vim ~/hello.c.
Then vim would starts with "set nu" turned on only on this
buffer, because vim(plugin) recorded
that setting "set nu" was != default on this buffer(pathname).

Just like .viminfo is automatically saves and restores
line# per per-pathname.

Thanks
L

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