Fix handling of choice elements that specify SimpleQuantity as a choice type

.tool-versions

@@ -1 +1 @@
-nodejs 18.16.0
+nodejs 22.15.0

DEPENDENCY-NOTES.md

@@ -0,0 +1,5 @@
+As of 2025 Aug 22:
+
+The `npm outdated` command reports some dependencies as outdated. They are not being updated at this time for the reasons given below:
+
+- `chai`: major version 5 only supports ESM; using CommonJS require no longer works.

eslint.config.cjs

@@ -0,0 +1,51 @@
+const { defineConfig, globalIgnores } = require('eslint/config');
+
+const globals = require('globals');
+const js = require('@eslint/js');
+
+const { FlatCompat } = require('@eslint/eslintrc');
+
+const compat = new FlatCompat({
+  baseDirectory: __dirname,
+  recommendedConfig: js.configs.recommended,
+  allConfig: js.configs.all
+});
+
+module.exports = defineConfig([
+  globalIgnores(['lib']),
+  {
+    extends: compat.extends('eslint:recommended', 'prettier'),
+
+    languageOptions: {
+      globals: Object.assign({}, globals.node, globals.mocha),
+
+      ecmaVersion: 6,
+      sourceType: 'module',
+
+      parserOptions: {
+        ecmaFeatures: {
+          experimentalObjectRestSpread: true
+        }
+      }
+    },
+
+    rules: {
+      'linebreak-style': ['error', 'unix'],
+
+      'no-console': [
+        'warn',
+        {
+          allow: ['warn', 'error']
+        }
+      ],
+
+      'no-unused-vars': [
+        'error',
+        {
+          vars: 'all',
+          args: 'none'
+        }
+      ]
+    }
+  }
+]);