standback 0.4.3

New standard library, old compiler.
Documentation 
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pub(crate) mod f32 {
    pub(crate) mod consts {
        pub const TAU: f32 = 6.28318530717958647692528676655900577_f32;
    }
}

pub(crate) mod f64 {
    pub(crate) mod consts {
        pub const TAU: f64 = 6.28318530717958647692528676655900577_f64;
    }
}