The following example (in Rust) draws an oval and a rectangle (as expected), but the oval has a dark outline:

#[no_mangle]
fn update() {
    unsafe { *DRAW_COLORS = 2 }
    oval(40, 20, 80, 40);

    unsafe { *DRAW_COLORS = 2 }
    rect(40, 80, 80, 40);
}

I would expect this code (and the equivalent DRAW_COLORS = 0x02) to draw a filled oval with no outline.

This seems to be either a bug or the documentation could be more explicit, especially because the hello world example also uses DRAW_COLORS = 2.

Version

w4 --version is 2.2.0

Workaround

Replacing 2 with 0x22 works as it draws the outline in the same color as the rest of the oval.