title: In Tcl is whitespace equal to Empty string?
body: <p>I am using the switch statement to match some options which may or may not have VALUES associated with them, then extracting the values (which I imagine could be nothing or just a bunch of empty strings). </p>
  
  <p>In Tcl are these equivalent? I.e. will trailing white space be fed as an option or parsed out? Should I "string trim" the value or is this unnecessary?</p>
  
  <p>**</p>