Is `a

by

This is documented here.

Formally, if a, b, c, …, y, z are expressions and op1, op2, …, opN
are comparison operators, then a op1 b op2 c … y opN z is equivalent
to a op1 b and b op2 c and … y opN z, except that each expression is
evaluated at most once.

And, as an example,

Comparisons can be chained arbitrarily, e.g., x < y <= z is equivalent
to x < y and y <= z, except that y is evaluated only once (but in both
cases z is not evaluated at all when x < y is found to be false).

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