[apgwoz]

There have always been attempts at caching non-string values in Tcl for performance gains, but the semantics are the same. The value’s types are whatever the operator requires and an error when not compatible. If, internally, $x is an integer, and you pass it to a string function, well, $x gets temporarily turned into a string. Dynamic with “weak” types.

[pjmlp]

Which is exactly the quoted text.

[apgwoz]

No. The quoted text says nothing about the value semantics, only the representation…