variable "hosts" in on.config masked by code

When I use the variable "hosts" in on.config:

$ cat ~/.on.config
hosts="foo bar"

then that variable is not available for me afterwards:

$ on hosts list
$

and that's because that variable is being used by the "on" script internally by itself.

Idea: review code an replace all variables and functions with "on_$name" variants and document that as a "forbidden" namespace?

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