Why are global variables *non-deletable* properties of the global object?

[Brendan Eich]

On Jun 19, 2008, at 6:33 PM, Brendan Eich wrote:

> If you are
> using the squarefree.com then you're not testing an ES-anything-
> conformant global object implementation!

I meant to hyperlink "shell" after "the squarefree.com" in this  
sentence to

http://www.squarefree.com/shell/shell.html

Indeed it uses eval, which makes var bindings deletable per ES1-3. (I  
don't recall the rationale for ES1 making var bindings created by  
eval deletable -- it was not something the original Netscape  
implementation did.)

/be