Operand evaluation order isn't defined for all operators, but it is for this one.
In list context, [,] is just the list argument separator, and inserts both its arguments into the list. These arguments are also evaluated from left to right.
That's perfectly fine.
- For example, Perl doesn't define the order in which f, g and h will be called by f() + g() + h().
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| < || < |
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