Why does the prettyprint of std::tuple start with [1]?

Paul Smith
2021-06-13T13:49:59Z

Am I the only one to be confused by the fact that the pretty-printer
for std::tuple values starts indexing at 1 instead of 0?

(gdb) p info
$1 = (const std::tuple<TestType, DataType> &) @0x7fffffffd550: {
param = std::tuple containing = {
[1] = TestType::OneTest,
[2] = DataType::SomeData
},
index = 2
}

Why aren't the indexes on the left numbered [0] and [1], corresponding
to the values used with std::get(), instead of [1] and [2]?