Version 2.0.0:  June 5, 2026
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Deprecation and Removal:

+ Completely removed `read_alignment`, `write_alignment`, and `AlignmentSchema`.
  Removed "Alignment" from the valid definitions list and `AIRRSchema`.

Tabular Data and Parsing:

+ Updated `read_tabular` to initially treat logical columns as character data
  to prevent silent `NA` conversions during parsing, then explicitly casting
  valid logical character values.
+ Updated `validate_tabular` to support character strings representing logical
  values (e.g., "TRUE", "T", "False", "F") when validating logical fields.

Validation:

+ Enhanced `validate_entry` to support comprehensive validation of arrays
  without reference schemas, including item type checking (string, integer,
  number, boolean) and enum constraints.
+ Added rigorous type and enum validation for individual fields within
  `validate_entry`, providing explicit warnings for unrecognized types.
+ Added an ontology validation check in `validate_entry` to ensure that an
  ontology field is structured as a list before performing recursive validation.

Data Model and Schema:

+ Updated `AIRRSchema` to replace the `Acknowledgement` schema with the new
  `Contributor` schema.
+ Added a safety check in `extract_field_content` to handle fields with null
  properties safely.
+ 

Version 1.6.1:  February 12, 2026
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+ Sync version with release of python airr package.


Version 1.6.0:  July 7, 2025
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+ Updated schema set.

Version 1.5.0:  August 29, 2023
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+ Updated schema set and examples to v1.5.


Version 1.4.1:  August 27, 2022
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Significant internal refactoring to improve schema generalizability,
harmonize behavior between the python and R libraries, and prepare for
AIRR Standards v2.0.
   
Rearrangement:

+ Added the `aux_types` argument to `read_tabular`, `read_rearrangement`, and 
  `read_alignment` to allow explicit declaration of the type for fields that 
  are not defined in the schema.
+ Renamed `read_airr`, `write_airr`, and `validate_airr` to `read_tabular`,
  `validate_tabular`, and `validate_tabular`, respectively.

Data Model and Schema:

+ Defined new `read_airr`, `write_airr`, and `validate_airr` functions that
  support AIRR Data Model files that store arrays of objects in JSON or YAML.
+ Added support for the AIRR Model Data File and associated schema
  (DataFile, Info). The Data File data format holds AIRR object of
  multiple types and is backwards compatible with Repertoire metadata.
+ Added support for the new germline and genotyping schema
  (GermlineSet, GenotypeSet) and associated schema.


Version 1.3.0:  May 26, 2020
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+ Updated schema set to v1.3.
+ Added `info` slot to `Schema` object containing general schema information.
  
Version 1.2.0:  August 17, 2018
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+ Updated schema set to v1.2.
+ Changed defaults to `base="1"` for read and write functions.
+ Updated example TSV file with coordinate changes, addition of 
  `germline_alignment` data and simplification of `sequence_id` values.

Version 1.1.0:  May 1, 2018
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Initial release.
