# Changelog

All notable changes to this project will be documented in this file.

For more information about changelogs, check
[Keep a Changelog](http://keepachangelog.com) and
[Vandamme](http://tech-angels.github.io/vandamme).

## 3.3.0 - 7/19/26 Sun

-   [ENHANCEMENT] Tagged 2-tuples (`{:ok, payload}` / `{:error, payload}` — any `{atom, payload}` shape) are now transformed by every Digger operation: the payload is transformed, the tag is left untouched, and tuples nested inside maps and lists are handled transparently. Any other tuple shape (3-tuples, non-atom first element, `{}`) passes through unchanged, consistent with the library's existing passthrough convention. `flatten`/`unflatten` treat all tuples as leaf values per their documented non-map contract.

## 3.2.0 - 7/14/26 Tue

-   [ENHANCEMENT] New `Digger.flatten/2` collapses a nested map into a single-level map of separator-joined string paths (`%{a: %{b: 1}}` → `%{"a.b" => 1}`), and new `Digger.unflatten/2` rebuilds the nesting — the exact inverse for the maps `flatten` produces. The separator is configurable (`separator:`, default `"."`). Structs (calendar types included), lists, and empty maps are treated as leaf values and never descended into; non-map input passes through unchanged, like every other Digger operation.

## 3.1.1 - 7/12/26 Sun

-   [BUG FIX] Fixed deprecated negative-step `String.slice/2` ranges in the internal camelize path (five call sites), which emitted a runtime deprecation warning on every `camel_case` call under Elixir 1.19+. Output is unchanged; a regression test now asserts `camel_case` writes nothing to stderr.
-   [DOCS] hexdocs now renders the README as the landing page with the CHANGELOG and a new "Recipes" sidebar group (ex_doc `docs:` config was previously absent), including a Phoenix/JS camelCase↔snake_case bridge guide composed from existing functions.
-   [DOCS] README rewritten to lead with the library's differentiators (zero runtime deps, atom-table-safe `atomize(existing: true)`, key *and* value transforms, calendar-struct passthrough) and a copy-paste bridge recipe; dead Inch CI / CodeClimate badges removed, hexdocs badge added.
-   [DOCS] All seven protocol functions now carry `iex>` examples run as doctests on every test build; every example was verified against the library before being documented.

## 3.1.0 - 7/5/26 Sun

-   [ENHANCEMENT] Atomizer module now supports an `existing: true` option to atomize via `String.to_existing_atom/1` instead of `String.to_atom/1`, so atomizing untrusted/external input can no longer grow the atom table unbounded; strings with no matching atom pass through unchanged rather than raising or minting a new one. Default behavior is unchanged.

## 3.0.0 - 12/14/18 Fri

-   [breaking change] - Stringifier module API updated to allow maps nested within lists to have their keys (and values) "stringified".
-   [breaking change] - CamelCaser module API updated to allow maps nested within lists to have their keys (and values) "camelized".
-   [breaking change] - Atomizer module API updated to allow maps nested within lists to have their keys (and values) "atomized".
-   [breaking change] - Dasher module API updated to allow maps nested within lists to have their keys (and values) "dasherized".
-   [breaking change] - LowerCaser module API updated to allow maps nested within lists to have their keys (and values) "lower-cased first".
-   [breaking change] - SnakeCaser module API updated to allow maps nested within lists to have their keys (and values) "snake-cased".
-   [breaking change] - UpperCaser module API updated to allow maps nested within lists to have the first letter of keys (and values) upcased

## 2.0.1 - 12/12/18 Wed

-   [BUG FIX] - Stringifier module updated to allow an atom not to be atomized, with respect to maps

## 2.0.0 - 12/6/18 Thurs

-   [breaking change] - Atomizer module updated to apply #atomize to lists (including char lists).
-   [breaking change] - CamelCaser module updated to apply #camel_case to lists
-   [breaking change] - Dasher module updated to apply #dasherize to lists
-   [breaking change] - LowerCaser module updated to apply #lowercase_first to lists
-   [breaking change] - SnakeCaser module updated to apply #snake_case to lists
-   [breaking change] - Stringifier module updated to apply #stringify to lists
-   [breaking change] - UpperCaser module updated to apply #upcase_first to lists

## 1.0.0 - 2/17/18 Sat

-   [breaking change] Atomizer#atomize now expects a symbol :atomize instead of a string if you want to "atomize" a data type
-   [breaking change] Stringifier#stringify now expects a symobl :stringify instead of a string if you want to "stringify" a data type

## 0.5.0 - 11/19/17 Sun

-   [ENHANCEMENT] Atomizer module updated to use protocols
-   [ENHANCEMENT] Stringifier module updated to use protocols
-   [ENHANCEMENT] Floating point keys are now handled by the various protocols
    (see tests)

## 0.4.0 - 11/12/17 Sun

-   [FEATURE] CamelCaser module to camelize nested (and non-nested) map keys
-   [FEATURE] UpperCase module to upcase the first letter of nested (and non-nested) map keys
-   [FEATURE] LowerCase module to lowercase the first letter of nested (and non-nested) map keys
-   [FEATURE] Dasher module to dasherize the underscored nested (and non-nested) map keys

## 0.3.0 - 11/9/17 Thurs

-   [FEATURE] Module to underscore nested (and non-nested) map keys

## 0.2.0 - 9/13/17 Weds

-   [FEATURE] Module to convert nested (and non-nested) map keys to "stringified" keys

## 0.1.0 - 9/12/17 Tues

-   [FEATURE] Module to convert nested (and non-nested) map keys to "atomized" keys