The initial PR.

.circleci/config.yml

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+version: 2.1
+
+orbs:
+  node: circleci/[email protected]
+
+workflows:
+  test:
+    jobs:
+      - node/test:
+          setup:
+            # derive cache key from package.json
+            - run: cp package.json package-lock.json
+          override-ci-command: rm package-lock.json && npm install && git checkout -- package.json
+          matrix:
+            parameters:
+              version:
+                - 18.0.0
+                - 20.0.0
+                - 22.0.0

.config

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+repo-owner = sanctuary-js
+repo-name = sanctuary-set
+min-branch-coverage = 0
+contributing-file = .github/CONTRIBUTING.md
+source-files = src/**/*.js
+module-type = commonjs

.eslintrc.json

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+{
+  "root": true,
+  "extends": ["./node_modules/sanctuary-style/eslint.json"],
+  "parserOptions": {"sourceType": "module"},
+  "globals": {"globalThis": "readonly"},
+  "overrides": [
+    {
+      "files": ["test/**/*.js"],
+      "rules": {
+        "max-len": ["off"]
+      }
+    }
+  ]
+}

.github/CONTRIBUTING.md

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+# Contributing
+
+Note: __README.md__ is generated from comments in __index.js__. Do not modify
+__README.md__ directly.
+
+1.  Update local main branch:
+
+        $ git checkout main
+        $ git pull upstream main
+
+2.  Create feature branch:
+
+        $ git checkout -b feature-x
+
+3.  Make one or more atomic commits, and ensure that each commit has a
+    descriptive commit message. Commit messages should be line wrapped
+    at 72 characters.
+
+4.  Run `make test lint`, and address any errors. Preferably, fix commits
+    in place using `git rebase` or `git commit --amend` to make the changes
+    easier to review.
+
+5.  Push:
+
+        $ git push origin feature-x
+
+6.  Open a pull request.

.gitignore

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+/coverage/
+/node_modules/

.npmrc

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+package-lock=false

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2016 Sanctuary
+
+Permission is hereby granted, free of charge, to any person
+obtaining a copy of this software and associated documentation
+files (the "Software"), to deal in the Software without
+restriction, including without limitation the rights to use,
+copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.

index.js

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+import BoxedSet from './src/BoxedSet.js';
+
+export default BoxedSet;

package.json

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+{
+  "name": "sanctuary-set",
+  "version": "0.0.0",
+  "description": "Fantasy Land compliant immutable set type",
+  "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "git://github.com/sanctuary-js/sanctuary-set.git"
+  },
+  "type": "module",
+  "exports": {
+    ".": "./index.js",
+    "./package.json": "./package.json"
+  },
+  "scripts": {
+    "doctest": "sanctuary-doctest",
+    "lint": "sanctuary-lint",
+    "release": "sanctuary-release",
+    "test": "npm run lint && sanctuary-test && npm run doctest"
+  },
+  "dependencies": {
+    "sanctuary-show": "2.0.0"
+  },
+  "devDependencies": {
+    "jsverify": "0.8.x",
+    "sanctuary-scripts": "7.0.x"
+  },
+  "files": [
+    "/src"
+  ],
+  "keywords": [
+    "fantasy-land",
+    "immutable",
+    "set"
+  ]
+}