30-seconds-of-code/node_modules/sift/changelog.md

3.3.x

• $in now uses toString() when evaluating objects. Fixes #116.

2.x

• use() now uses a different format:

sift.use({
  $operator: function(a) {
    return function(b) {
      // compare here
    };
  }
})

• all operators are traversable now
• fix #58.