Help needed on trace() to locate user var reference and contents

Sun 2020.04.19

I need to monitor the number of blocks a user var requires in memory. I need to extract or view
the contents of that var, using the reference that trace provides.

Using trace,

http://www.espruino.com/Reference#l__glo­bal_trace

I'm able to view it's ID and space utilized: #348 and #531

     #348[r1,l2] Name String [1 blocks] "\xFFcod"        #531[r1,l0] FlatString [137 blocks] "console.log( \"    \" );\n  console.log( \"JsVars  Last:\

What I am after is how to get the value #531 and it's contents. It takes up 137 blocks.

Pairing down, now that I know the ID \xFFcod of the var

>trace(["\xFFcod"]);
#990[r0,l1] Array(1) [
  #986[r1,l2] Name Integer 0    #989[r1,l0] String [1 blocks] "\xFFcod"
]

But a curious response emerges, the reference value changes from #348 to #990, but it is the same location in memory?

Q1: Why does the refrence value change and what is that value exactly?
Q2: Wht is the meaning of 'r0' and 'l1' and compared to 'r1' and 'l2' ?

Using getSizeOf()

>E.getSizeOf(["\xFFcod"], 2)
=[
  {
    name: "0",
    size: 2 }
 ]
>

>E.getSizeOf(["\xFFcod"], 1)
=[
  {
    name: "0",
    size: 2 }
 ]

>E.getSizeOf(["\xFFcod"], 0)
=3
> 

Q3: What is the 'name' attribute refereing to?
Q4: What are the return values here as they don't seem to be the actual blocks as returned in a trace request?
Q5: How to get the value #531 and it's contents using trace() ?

Thank you in advance. . . .