Method into_exact_or

crates/vm/src/object/ext.rs:122–132

(
        self,
        ctx: &Context,
        f: impl FnOnce(Self) -> PyRefExact<T>,
    )

impl<T: PyPayload> PyRef<T> {
    pub fn into_exact_or(
        self,
        ctx: &Context,
        f: impl FnOnce(Self) -> PyRefExact<T>,
    ) -> PyRefExact<T> {
        if self.class().is(T::class(ctx)) {
            unsafe { PyRefExact::new_unchecked(self) }
        } else {
            f(self)
        }
    }
}

/// PyRef but guaranteed not to be a subtype instance