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Builds on #4359 (which added the Arrow 19-21 test aliases) and makes the package genuinely work across the whole peer range: * Resolve the library's own `apache-arrow` to 21.2.0 (devDependency) so the main CI jobs build, type-check and test on the newest release, and widen the peer range to `>=15.0.0 <22.0.0` instead of an exact pin. * Add a CI job that re-installs with `apache-arrow` resolved to 19.0.1 and 20.0.0 and runs the suite, covering what a consumer on those versions gets. * Arrow 21 overrides `Symbol.hasInstance` on Schema/Field/Table/RecordBatch/ Data so `instanceof` matches objects from another copy of the library, but not on DataType. The sanitizer's short-circuits therefore returned foreign schemas unchanged and Arrow's builders then failed with "Unrecognized type 'NONE'". Check the real prototype chain instead. * Sanitize the types added in Arrow 20/21 (LargeList, Utf8View, BinaryView, IntervalMonthDayNano), looked up dynamically so the library still compiles and runs on older Arrow releases, with a clear error when the installed Arrow lacks the type. Carry `variadicBuffers` through `Data`. * Loosen `FieldLike` so a branded DataType from another Arrow copy still type-checks; export the new `DataTypeLike`. * Share the Arrow version list between test files, exercise embedding function types per version in the registry tests, and add sanitize and end-to-end coverage for the new column types. * Enable `skipLibCheck`: flatbuffers 25 (via Arrow 21) ships declarations that need TypeScript 5.7+. * Record the new dev dependencies in the third-party license inventory. Co-Authored-By: Vincent Koc <vincentkoc@ieee.org> Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>