• fix JTD serialisation (remove leading comma in objects with only optional properties) (#2190, @piliugin-anton)
• empty JTD "values" schema (#2191)
• empty object to work with JTD utility type (#2158, @erikbrinkman)
• fix JTD "discriminator" schema for objects with more than 8 properties (#2194)
• correctly narrow "number" type to "integer" (#2192, @JacobLey)
• update Node.js versions in CI to 14, 16, 18 and 19