As to my second point this is probably a hint:

4.2.11. Required String Values
Rexx requires a string value in a number of contexts within instructions and 
built-in function calls.
• DO statements containing exprr or exprf
--------->>>>>>>  • Substituted values in compound variable names

---- Walter Pachl <christel.u.w.pa...@chello.at> schrieb:
> Two questions / observations regarding rexxref.pdf:
> 
> 5.3.2. The Collection Class
> 5.3.2.16. union
> ...
> >>-union(argument)-<
> The argument must also allow all of the index values in the receiver 
> collection.
> 
> >>>  add: The ITEMS in the argument must be acceptable by the receiver 
> >>> collection.
> 
> 5.3.15. The Stem Class
> 5.3.15.4. []=
> 
> >>>  add: the index used for the stem object is the required string value of 
> >>> the
>        specified index object.    
> 
> My test
> pa=.payroll~new(1,'Walter',1000)   -- an object
> M=.Stem~new; m[pa]='I'    -- string value of pa is used as index
> 
> correct? 
> Regards
> Walter 
> 
> 
> 
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