v0.2.0

0.2.0 - 2026-07-25

Added

• LeapSecond.expires_on, LeapSecond.expired? and
  LeapSecond.updated_through expose the expiry date and IERS bulletin that
  Leap_Second.dat states in its header. Both were previously discarded with
  the rest of the comment lines. Unlike Data.status.cache_age, which measures
  when a file was downloaded, these describe how long the data itself stays
  authoritative.
• LeapSecond.at now answers 1961-01-01 through 1972-01-01, the era when UTC
  was steered by rate adjustments rather than whole leap seconds. It returns
  those values as exact Rationals. The coefficients come from the USNO
  tai-utc.dat file and are bundled in source, since they are fixed. The
  change is additive: the pre-1972 range previously raised, so no successful
  call returns anything different. TAI.utc_to_tai and TAI.tai_to_utc gain
  the same range for free.

Changed

• Parsers::LeapSecond.parse returns a Table of entries and metadata
  instead of an array of entries. Parsers is internal; the public API is
  unaffected.
• Parsers::LeapSecond.parse no longer raises Encoding::CompatibilityError
  on a file containing invalid UTF-8. Header metadata is read on a best-effort
  basis and an unreadable data row raises ParseError as before.

Full Changelog: v0.1.1...v0.2.0