v0.4.2

Changes

• Add Context struct

  • For user-controlled precision and rounding
  • Support for a few BigDecimal functions added (eg: sqrt_with_context(&self, ctx: &Context)) , more to come in future versions.
  • Note standard operations use default (compile-time-defined) context

• Add BigDecimalRef struct

  • Non-owning BigDecimal struct that has some non-digit-changing methods (i.e. change sign/scale without copying digits) for more efficient calculations
  • Implements math operations Add,Sub
  • Implement From<&BigInt> for BigDecimalRef

• Compile-time default rounding mode may be set by environment variable RUST_BIGDECIMAL_DEFAULT_ROUNDING_MODE

• Fix issue recompiling if RUST_BIGDECIMAL_DEFAULT_PRECISION haddn't changed

• Add BigDecimal::with_precision_round()

  • trim the bigdecimal after operations, rounding at given point

• Add BigDecimal::fractional_digit_count()

  • Return's the bigdecimal's "scale", (number of digits right of the decimal point)

• Support reading subnormal floating-point numbers

• Improve initial "guess" in calculation of inverted value.

• Fix panic in from_str_radix (#115)

• (internal) Reorganize std::ops implementations by moving each to separate functions (src/impl_ops_add.rs, src/impl_ops_sub.rs, etc)

Performance Improvements

• BigDecimal::eq takes into account trailing zeros, avoids aligning digits
• (internal) ten_to_the - used everywhere to align BigIntegers within BigDecimals, all operations with high precision numbers should be faster