Currently, we only propagate types of sole, unquoted expansions (variable,
function call, or eval context), similar to NULL. To untypify the value,
simply quote it.
The .include directive and if-else no longer have to be separated from the
following token. This allows to make the decision by looking at just one
token.
The test scope can no longer have a description inside the scope. It should
always be leading the scope itself.