Each value on the calculator stack is a treated as a text value. When an operation needs to pop a value off the stack, it must first parse the value into the desired type. Results are then formatted to a string before being pushed back onto the stack.
Each type has a function for parsing and formatting. A value is considered to be of a type if it can be successfully parsed by that type's parse function. The parse function for a floating point number can parse values such as 6, 6.4, 6e4 but not '6 2/5' which requires a conversion function.
The special type Any represents any value that can appear on the stack.
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