Function expect_vec2

perro_source/core/perro_animation/src/panim/fields.rs:425–430

(value: &SceneValue, key: &str, line_no: usize)

        return Ok(v as i32);
    }
    Err(format!("line {}: `{}` expects i32", line_no, key))
}

fn expect_bool(value: &SceneValue, key: &str, line_no: usize) -> Result<bool, String> {
    value
        .as_bool()
        .ok_or_else(|| format!("line {}: `{}` expects bool", line_no, key))
}