Hi,
I may have overlooked it, but I could not find the description of the function puts in the documentation section Built-in_and_library_functions. That’s a bit funny since it is the most used function in examples 
The puts() function is actually just the Tcl puts function. In L if a function isn’t defined by L, it just falls through to tcl.
Oh? All right, then.
This leads me to ask, to what extent do you need to know Tcl and keep it in mind when reading/coding L?
It really helps to know Tcl, or be willing to look at the Tcl docs, because we haven’t wrapped all the functions that you might want.