pub trait Round {
fn floor(&self) -> Self;
fn ceil(&self) -> Self;
fn round(&self) -> Self;
fn trunc(&self) -> Self;
fn fract(&self) -> Self;
}
fn floor(&self) -> Selffn ceil(&self) -> Selffn round(&self) -> Selffn trunc(&self) -> Selffn fract(&self) -> Self
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