Rslogix 5000 syntax

Why does RSlogix 5000 allow a tag name "integer.1" and "integer.[1]" to be interchangeable? For the elements of the integer, it doesn't matter whether the bit number is bracketed or not. I am just curious. Thank you.

Integer.1 can only be a fixed address
Integer.[index+1] can be an expression

AustralIan said:

Integer.1 can only be a fixed address
Integer.[index+1] can be an expression

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I see. That makes sense.
Other programmers I work with use either method even for a fixed address. I will have to implement a rule not to use the bracket for fixed address elements to make things easier for maintenance techs. Thank you.