problem when casting string to cstring on js backend

[choltreppe]

Hi,

I want to cast a string generated by flatty (a serialization lib) to a cstring. 
But when the string contains a char with value over 127 the string gets 
completly wrong. I guess that has something todo with chars over 127 normaly 
indicating the beginning of a utf8 char, but not being a correct utf8 char?

Heres the code of a little isolated test of the problem:
    
    
    import flatty
    
    let str = toFlatty(128)
    for c in str: echo ord(c)
    echo "-"
    for c in cstring(str): echo ord(c)
    
    
    Run

result: `128 0 - 37 56 48 0`

thanks,

chol