Add opt-in strict decoding for unknown keys

.github/CODEOWNERS

@@ -0,0 +1,17 @@
+# Lines starting with '#' are comments.
+# Each line is a file pattern followed by one or more owners.
+
+# More details are here: https://help.github.com/articles/about-codeowners/
+
+# The '*' pattern is global owners.
+
+# Order is important. The last matching pattern has the most precedence.
+# The folders are ordered as follows:
+
+# In each subsection folders are ordered first by depth, then alphabetically.
+# This should make it easy to add new rules without breaking existing ones.
+
+# Code owners must always be teams, never individuals.
+
+# Global rule:
+*           @euc-eng/g-euc-github-continuity-admins

.github/dependabot.yml

@@ -11,16 +11,34 @@ updates:
   - package-ecosystem: github-actions
     directory: /
     schedule:
-      interval: monthly
+      interval: weekly
     commit-message:
       prefix: 'ci(Deps): '
+    cooldown:
+      default-days: 5
+      include:
+        - '*'
+    groups:
+      all:
+        applies-to: version-updates
+        patterns:
+          - '*'
 
   - package-ecosystem: npm
     directory: /
     schedule:
-      interval: monthly
+      interval: daily
     commit-message:
       prefix: 'ci(Deps): '
+    cooldown:
+      default-days: 3
+      include:
+        - '*'
+    groups:
+      all:
+        applies-to: version-updates
+        patterns:
+          - '*'
 
   - package-ecosystem: devcontainers
     directory: /

.github/workflows/main.yml

@@ -50,7 +50,7 @@ jobs:
     - name: Checkout repository
       uses: actions/checkout@v6
     - name: Spellcheck Action
-      uses: rojopolis/spellcheck-github-actions@0.60.0
+      uses: step-security/spellcheck-github-actions@158f059d02d7d87190bb83f9cdd99922317ce067 # v0.66.0
       with:
         config_path: .github/config/spellcheck.yaml
 

CHANGELOG.md

@@ -1,3 +1,10 @@
+## Unreleased
+
+### 🚀 Features
+
+* added opt-in strict decoding that rejects unsupported keys with
+  `rejectUnknownKeys` on `Codable` and `ConformDecodable`
+
 ## [1.6.2](https://github.com/SwiftyLab/MetaCodable/compare/v1.6.1...v1.6.2) (2026-10-23)
 
 
@@ -215,4 +222,3 @@
 ### 💄 Styles
 
 * add development with vscode support ([323a94a](https://github.com/SwiftyLab/MetaCodable/commit/323a94a3a1e824a2b93c1aecb51d47a90c0ec3e3))
-

README.md

@@ -25,6 +25,7 @@ Supercharge `Swift`'s `Codable` implementations with macros.
 - Allows to provide default value in case of decoding failures with ``Default(_:)``, or only in case of failures when missing value with ``Default(ifMissing:)``. Different default values can also be used for value missing and other errors respectively with ``Default(ifMissing:forErrors:)``.
 - Allows to create custom decoding/encoding strategies with ``HelperCoder`` and using them with ``CodedBy(_:)``, ``CodedBy(_:properties:)`` or others. i.e. ``LossySequenceCoder`` etc.
 - Allows applying common strategies like `ValueCoder` to all properties of a type through the ``Codable(commonStrategies:)`` parameter, reducing the need for repetitive property annotations.
+- Allows opt-in rejection of unsupported decoding keys with the `rejectUnknownKeys` parameter on ``Codable(commonStrategies:rejectUnknownKeys:)`` and ``ConformDecodable(commonStrategies:rejectUnknownKeys:)``.
 - Allows specifying different case values with ``CodedAs(_:_:)`` and case value/protocol type identifier type different from `String` with ``CodedAs()``.
 - Allows specifying enum-case/protocol type identifier path with ``CodedAt(_:)`` and case content path with ``ContentAt(_:_:)``.
 - Allows decoding/encoding enums that lack distinct identifiers for each case data with ``UnTagged()``.

Sources/MetaCodable/Codable/Codable.swift

@@ -50,6 +50,8 @@
 /// - Parameters:
 ///   - commonStrategies: An array of CodableCommonStrategy values specifying
 ///   type conversion strategies to be automatically applied to all properties of the type.
+///   - rejectUnknownKeys: Whether decoding should fail when a keyed container
+///   contains keys that are not recognized by the generated implementation.
 ///
 /// - Important: The attached declaration must be of a `struct`, `class`, `enum`
 ///   or `actor` type. [See the limitations for this macro](<doc:Limitations>).
@@ -63,7 +65,10 @@
     names: named(CodingKeys), named(init(from:)), named(encode(to:))
 )
 @available(swift 5.9)
-public macro Codable(commonStrategies: [CodableCommonStrategy] = []) =
+public macro Codable(
+    commonStrategies: [CodableCommonStrategy] = [],
+    rejectUnknownKeys: Bool = false
+) =
     #externalMacro(module: "MacroPlugin", type: "Codable")
 
 /// Indicates whether super class conforms to `Codable` or not.

Sources/MetaCodable/Codable/Decodable.swift

@@ -44,6 +44,8 @@
 /// - Parameters:
 ///   - commonStrategies: An array of CodableCommonStrategy values specifying
 ///   type conversion strategies to be automatically applied to all properties of the type.
+///   - rejectUnknownKeys: Whether decoding should fail when a keyed container
+///   contains keys that are not recognized by the generated implementation.
 ///
 /// - Important: The attached declaration must be of a `struct`, `class`, `enum`
 ///   or `actor` type. [See the limitations for this macro](<doc:Limitations>).
@@ -56,5 +58,8 @@
     names: named(CodingKeys), named(init(from:))
 )
 @available(swift 5.9)
-public macro ConformDecodable(commonStrategies: [CodableCommonStrategy] = []) =
+public macro ConformDecodable(
+    commonStrategies: [CodableCommonStrategy] = [],
+    rejectUnknownKeys: Bool = false
+) =
     #externalMacro(module: "MacroPlugin", type: "ConformDecodable")