Function protected_call_with 

pub fn protected_call_with<E>(
    cx: &mut Cx,
    function: Value,
    args: Args,
    map_error: impl FnOnce(&mut Cx, Error) -> Result<E>,
) -> Result<ProtectedOutcome<E>>

Calls function while allowing a typed raised payload at the boundary.

This is the generic seam used by crate::RaisedProtectedOutcome; the original protected_call remains source-compatible for ordinary values.