<commit_before># next

## Bug fixes

* Fix a bug in the What4 backend that could cause applications of `(@)` with
  symbolic `Integer` indices to become out of bounds (#1359).

# 2.13.0

## Language changes

* Update the implementation of the Prelude function `sortBy` to use
  a merge sort instead of an insertion sort. This improves the both
  asymptotic and observed performance on sorting tasks.

## UI improvements
<commit_msg>Add :time to CHANGES.md<commit_after># next

## Bug fixes

* Fix a bug in the What4 backend that could cause applications of `(@)` with
  symbolic `Integer` indices to become out of bounds (#1359).

## New features

* Add a `:time` command to benchmark the evaluation time of expressions.

# 2.13.0

## Language changes

* Update the implementation of the Prelude function `sortBy` to use
  a merge sort instead of an insertion sort. This improves the both
  asymptotic and observed performance on sorting tasks.

## UI improvements

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{'dir': 'git-commits-cleaned', 'id': '39412', 'n_tokens_mistral': 283, 'n_tokens_neox': 267, 'n_words': 136}