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Here are my TCL questions:

- I see that there are "integer", "wide integer", "float", "list" and string types in TCL. Is there a builtin that can discern which type a variable has and/or discern which type[s] a variable can be coerced to?

- Is there a string concatenation operator? (besides "$a$b").

- What is the difference between an array¹ and a dict? The tutorial makes it clear both exist and explain the difference very poorly.

¹ This refers to an associative array not a list