"First class" support for ARM processors is featured as well. "Our test suite must be continually passing on ARMv6, ARMv7, and the new 64-bit ARMv8 processors. So Node.js is officially ready for use by hobbyists and ARM server users alike," according to the blog post
Version 4.0 brings about a regular release cycle -- the lack of regular releases had caused dissension leading to the io.js fork -- and a plan for a long-term support. "Release versioning now follows SemVer (Semantic Version 2.0), so expect increments of both minor and patch version over the coming weeks as we fix bugs and add features." The support plan, meanwhile, involves issuing LTS (long-term support) releases every 12 months, following the first LTS release in October. These releases will be maintained for 18 months, with no more than two active LTS releases at any given time.
"As always with a major release, we don't expect the adoption of Node.js v4 to be painless," the blog said. "It will take time to adapt, particularly as compiled add-ons catch up with the new version of V8 (hint: see NAN for our official solution to the compatibility problem). Thankfully, the io.js v3.x series of releases have given many add-on authors a chance to prepare their code for Node.js v4, so much of the npm ecosystem is ready today."