1.6 2022-12-06

• Use the standard inf and sup for the bounds of the interval.

• Prefer ..._up and ..._dw to mark the rounding of functions and
  RoundUp and RoundDown for the modules. Crlibm was updated
  accordingly.

• Rename Interval as Interval_base as it conflicted with the
  Interval module in compiler libs (provoking a collision when this
  library was used in the REPL).

• Add functions mag (magnitude) and mig (mignitude), mid
  (midpoint), singleton (creation of intervals containing a single
  value), is_singleton, diam (diameter), belong (x ∈ I), floor,
  ceil and hypot.

• Renamed Interval_*.t as Interval_*.interval as to not import the
  short type t into the namespace (but still have access to the
  record fields).

• Add functions RoundDown.dist and RoundUp.dist (downward/upward
  rounded distance).

• Use Dune 2.0.

1.5.1 2019-05-01

• Fix the implementation of exponentiation (xⁿ, n ∈ ℤ).

• Deprecate the size… functions in favor of width….

• Add functions mag (magnitude) and mig (mignitude).

1.5 2019-04-06

• The library is now organized as 4 packages:

  • interval_base defines the module Interval that groups the
    functions that work on any IEEE-754 processor and offers
    basic module signatures;

  • interval_intel: defines a module Interval_intel using assembly
    instructions on Intel Processors;

  • interval_crlibm: defines a module Interval_crlibm using the
    library CRlibm to evaluate standard functions (sometimes a bit
    slower but proved enclosures in contrast to the Intel package for
    which enclosures are not always 100% correct).

  • interval: a meta-package that install all above three.

• Interval.T is a module signature to form the base of what is
  expected of any interval package.

• New functions: invx (extended inverse), cancelminus,
  cancelplus, inter inter_exn, low, high.

• New binary relations equal, =, subset, <=, >=, precedes,
  interior, <, >, strict_precedes, disjoint.

• New predicates is_bounded, is_entire.

• New constants I.half_pi ∋ π/2 and I.entire for [-∞, +∞].

• Interval_crlibm: functions expm1, log1p, log2, log10,
  cospi, sinpi, tanpi, acospi, asinpi, atanpi, not present
  in the Intel version.

• The module I.U also restores inequality relations.

• Speed and documentation improvements.

1.4 2018-03-01

• Improved interface for the Interval library by using sub-modules
  and standard mathematical names. In particular, all operations —
  including infix operators — are in a sub-module I which can
  conveniently be used to introduce local scopes after issuing open Interval.

• Improved pretty-printing functions allowing to pass the format of
  the interval bounds.

• The library functions now signal errors by exceptions
  Division_by_zero and Domain_error that are local to
  Interval.

• The Fpu module has been redesigned: the rounding up or down of
  functions is controlled by the sub-module (Low or High) to which
  they belong. This allows for natural expressions such as
  Low.(x**2. +. 2. *. x +. 1.).

• Jbuilder/dune is used to compile and install the library.

• TravisCI and AppVeyor continuous integration ensure the library
  works on a variety of OCaml versions and platforms.