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I see, I misunderstood.

claps

Right, that won't work—Object.freeze only sets the meta object descriptor properties to: [[configurable]]: false, [[writable]]: false. It won't turn a non-object into a const. What you could do is provide a "built-in" keyword whose value is true and is essentially a const binding. Special keywords are safe additions, as long as they're not any of the FutureReservedWords: class, enum, extends, super, const, export, import, implements, let, private, public, interface, package, protected, static or yield; additionally, there is precedent in node with bindings like process, which aren't const, but are special (if you attempt to reassign it, the process itself will crash)

If the value is actually a floating point number, but you're receiving a string, then you should be able to simply coerce the value to a number and the non-numeric characters will be discarded:

var ph = "8.55\r\n";

+ph === 8.55; // true

Unfortunately, that doesn't seem to work correctly in Espruino. I've filed a bug: https://github.com/espruino/Espruino/issues/268

There are several new syntax proposals for ES7 that would like to make use of "#", as it's one of the last ascii characters available. I strongly recommend avoiding the introduction of non-standard syntactic forms.

• Ecma/TC39 member, working on ES6
  
• Creator of:
  
  • Johnny-Five
    
  • Galileo-IO
    
  • Spark-IO
    
• Espruino contributor/committer
  
• jQuery Core committer
  
  

Regarding:

for (var i in ["a","b","c"]) console.log(i)
"a"
"b"
"c"

This is incorrect. for-in will assign the value of the "key" (in this case the numeric index) to i, not the property "value".

This is correct:

for (var i in ["a","b","c"]) console.log(i)
0
1
2