Property ECMAScript5

If you are looking to port JavaScript3 up to strict ECMAScript5 in whole, part, stages but you have some choice for mission-critical applications, here is a glimpse from the package CURL.LANGUAGE.REFLECTION

Property (class)
public abstract sealed Property {inherits ClassMember}
Package: CURL.LANGUAGE.REFLECTION
Direct Known Subclasses: Getter, Option, Field, Setter
The representation of a property: Field, Getter, Setter, or Option.

The Property class provides a singular point of contrast for a mature web language against a maturing web language.

What is facilitated are such primitives of the Curl language as private-set

field public-get private-set key-field:int

There is as yet no tool for PITL with CommonJS packages comparable to the ability of the Curl Documentation Viewer to display selectively only public, non-inherited properties of a class as part of a package.  And what is PITL without such tools for communicating what is in a API?  Now look for comparable 'live-code' example facilities for training developers new to a language (they may yet appear in JavaScript as part of Avocado with Lively-Kernel.)

When I hear advocates of reusing an existing JavaScript codebase for PITL on industrial-quality server-side applications I wonder whatever they can be thinking?  Would this have been an aerospace argument to stick with aluminum?  After all, there are more aero-mech's out there accustomed to repairing aluminum aircraft components ... and far more aluminum in the air - and it was aluminum that made the air travel age possible ...