scientific 0.5.3

Arbitrary precision scientific number (no_std capable, in pure Rust)
Documentation 
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use core::ops::{Add, AddAssign, Sub, SubAssign};

/// The precision which should be used for some calculations.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum Precision {
  /// The number of digits to calculate to. If the number is less or equal to zero then the result is always zero!
  Digits(isize),
  /// The number of decimal places to calculate. Can be negative.
  Decimals(isize),
}

impl Precision {
  /// Shorthand for integer calculation (i.e. `Decimals(0)`).
  pub const INTEGER: Precision = Precision::Decimals(0);
  /// Shorthand for calculation with about the same precision as f64 (i.e. `Digits(16)`).
  pub const F64: Precision = Precision::Digits(16);
}

impl Default for Precision {
  fn default() -> Self {
    Precision::INTEGER
  }
}

impl Add<isize> for Precision {
  type Output = Precision;

  fn add(self, rhs: isize) -> Self::Output {
    match self {
      Precision::Digits(d) => Precision::Digits(d + rhs),
      Precision::Decimals(d) => Precision::Decimals(d + rhs),
    }
  }
}

impl AddAssign<isize> for Precision {
  fn add_assign(&mut self, rhs: isize) {
    match self {
      Precision::Digits(d) => *d += rhs,
      Precision::Decimals(d) => *d += rhs,
    }
  }
}

impl Sub<isize> for Precision {
  type Output = Precision;

  fn sub(self, rhs: isize) -> Self::Output {
    match self {
      Precision::Digits(d) => Precision::Digits(d - rhs),
      Precision::Decimals(d) => Precision::Decimals(d - rhs),
    }
  }
}

impl SubAssign<isize> for Precision {
  fn sub_assign(&mut self, rhs: isize) {
    match self {
      Precision::Digits(d) => *d -= rhs,
      Precision::Decimals(d) => *d -= rhs,
    }
  }
}