Function expect_bool

perro_source/core/perro_animation/src/panim/fields.rs:419–423

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

    if let Some(v) = value.as_f32()
        && v.is_finite()
        && v.fract() == 0.0
        && v >= i32::MIN as f32
        && v <= i32::MAX as f32
    {
        return Ok(v as i32);
    }
    Err(format!("line {}: `{}` expects i32", line_no, key))
}