Changes in version 0.1.1                        

  - zufast/datetime.h: ISO 8601 week dates. zuf_weekday_from_days(),
    zuf_iso_week_from_days() (week-numbering year and week),
    zuf_iso_weeks_in_year() and the inverse zuf_days_from_iso_week(),
    exact over the whole int32_t day range. Week dates are computed, not
    parsed.
  - zufast/datetime.h: zuf_parse_date_opt() and zuf_parse_datetime_opt()
    take flags. ZUF_DT_EXPANDED_YEAR accepts expanded years, a sign and
    exactly six digits as in Temporal (+010000-01-01, -271821-04-20),
    and rejects -000000. zuf_parse_date() and zuf_parse_datetime() keep
    the four-digit grammar.
  - Breaking change for years outside 0000 to 9999: zuf_format_date(),
    zuf_format_datetime() and fast_format_datetime() now pad expanded
    years to six digits (+010000-01-01, -000001-01-01), where 0.1.0
    padded to five. The formatters now write the form that Temporal
    writes and that ZUF_DT_EXPANDED_YEAR reads. Years 0000 to 9999 are
    unchanged.
  - New zufast/wide.h: 128-bit integers zuf_i128 and zuf_u128, for
    Temporal's epoch nanoseconds and durations in zutempo and for zuint.
    Both are two-word structs in every build. The header offers checked
    and wrapping add, subtract and multiply, the full 64 x 64 bit
    products, truncating and floor division by a 64- or 128-bit divisor,
    exact conversion to and from double, and decimal parsing and
    writing. The native __int128 is used inside the functions where the
    compiler has it. Defining ZUF_NO_INT128 selects the portable code,
    and the test suite checks that both give identical results.

                 Changes in version 0.1.0 (2026-10-21)                  

  - Initial CRAN release: a header-only library of small, fast, portable
    C99 primitives, used by other packages through LinkingTo: zufast
    alone.
  - zufast/number.h: correctly rounded parsing of double, float and
    32/64-bit integers in any base 2 to 36 (with a JSON mode), through
    the vendored ffc.h, a C port of fast_float; shortest round-trip
    formatting in ECMAScript notation through the vendored Ryu; exact
    fixed-notation formatting and integer writers.
  - zufast/datetime.h: ISO 8601 / RFC 3339 date and timestamp parsing to
    fields, calendar arithmetic exact over the whole int32_t day range,
    and RFC 3339 formatting.
  - zufast/literal.h (booleans with per-spelling flags, literal
    matching, ASCII whitespace), zufast/uuid.h, zufast/hex.h and
    zufast/base64.h (strict, standard and URL alphabets), zufast/hash.h
    (XXH3 64- and 128-bit, one-shot and streaming, through the vendored
    xxHash), zufast/bits.h (binary16, bfloat16, endian helpers) and
    zufast/utf8.h (UTF-8 validation and code-point counting).
  - R functions that exercise the C layer: fast_parse_double(),
    fast_parse_integer(), fast_format_double(), fast_parse_date(),
    fast_parse_datetime(), fast_datetime_fields(),
    fast_format_datetime(), fast_hex_encode(), fast_hex_decode(),
    fast_base64_encode(), fast_base64_decode(), fast_hash(),
    fast_utf8_valid() and fast_info().
  - vignette("linking") gives the consumer recipe.