pub trait ToPrimitive {
fn to_i8(&self) -> Option<i8>;
fn to_i16(&self) -> Option<i16>;
fn to_i32(&self) -> Option<i32>;
fn to_i64(&self) -> Option<i64>;
fn to_u8(&self) -> Option<u8>;
fn to_u16(&self) -> Option<u16>;
fn to_u32(&self) -> Option<u32>;
fn to_u64(&self) -> Option<u64>;
}
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