str-s-fetch:dstrings — ordinary primitive
Leave the string stack unchanged, and leave the string body address and length on the data stack. <ansref>"string-s-fetch"</ansref>
NOTE: In earlier versions this was call $S@S. The trailing "S" is superfluous if it is understood that the only string format that usually appears on the data stack is the Forth string format.
WARNING: If a$ is a bound string, it may move at the next garbage collection, making a.str invalid. This can be avoided by sandwiching sections of code where this could occur between $GC-OFF and $GC-ON.