Legacy assertion mode in Node Js

Legacy assertion mode uses the == operator in:

• assert.deepEqual()
• assert.equal()
• assert.notDeepEqual()
• assert.notEqual()

To use legacy assertion mode:

const assert = require('node:assert');
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Legacy assertion mode may have surprising results, especially when using assert.deepEqual():

// WARNING: This does not throw an AssertionError in legacy assertion mode!
assert.deepEqual(/a/gi, new Date());