in src/metrics/arabic.rs [96:106]
fn zero_width_char(target: u32) -> bool {
if target >= 0x610 && target <= 0x61A
|| target >= 0x64B && target <= 0x65F
|| target >= 0x670
|| target >= 0x6D6 && target <= 0x6ED
{
true
} else {
false
}
}