Kudos to @ImRodry and @puneetdixit200 for their contributions.

Fixed

• Fixed missing modularized optimization fallback (for Next.js and others). See #4193.

• Fixed pt locale first day of week to be Sunday. See #4195 by @ImRodry.

• Fixed zh-CN, zh-HK, and zh-TW locale month parsing for October, November, and December. See #4194 by @puneetdixit200.