The library has also been rewritten to be more compatible with ECMAScript 5 (ES5) after a number of methods popularised by the library were incorporated into the standard. These include array methods like
filter, which have been rewritten to the ES5 specification. Prototype can now act as a "polyfill" for browsers that do not support ES5, while being inert on browsers where it is natively supported.
Explaining why the minor release took so long, Dupont pointed out that he is now the only person who works on the code on a regular basis and that tends to involve "months of inaction followed by a flurry of commits and bug fixes – it’s fair to say that Prototype hibernates for long periods of time". Dupont reassures users that he has no plans to stop working on Prototype but can't commit to any release schedules or milestones.
Dupont invites developers interested in working on the code with specific fixes in mind to make them and issue a GitHub pull request on the project's repository. Dupont notes that Prototype 2 is "vaporware", existing only as a "collection of ideas contributed over the years by the Prototype core team and trusted friends" and that it is currently on the back burner as he focuses on working towards Prototype 1.8.