miconda left a comment (kamailio/kamailio#4444)
The variables framework was designed first for xlog module, and because of that
most of them hold the string value even when the type is int. Furthermore, when
there is an internal mapping between some string names (like protocol names:
"udp", ...) and integer ids (like protocol ids: PROTO_UDP, ...), the
implementation can hold the string name and interger id inside the same
variable.
Probably it is confusing if you try such kind of evaluation as `$vn(isTLS) =
$rP == "tls";` vs `$vn(isTLS) = "tls" == $rP;`, the scripting language
interpreter tries to autoconvert right-side of an expression to the type
discovered for the left side. This allows to concatenate strings with numbers
and add/substract/... to a number an auto-converted value from a string. This
is common for many scripting languages.
I am open to discuss what can be done better and review any PR that could try
to make it clearer, but auto-conversion based on left-side type is useful.
Anyhow, I added the topic to the upcoming Kamailio Developers Meeting, so we
can discuss it there as well if nothing is done before:
- https://www.kamailio.org/w/developers-meeting/
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