let Rust derive everything but Default for large arrays in 1.47 and later #2070
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fixes #1977 as of rust-lang/rust#74060 is available since Rust 1.47
Should I leave the existing tests as-is but target 1.40 as I did (showing I haven't broken anything for previous target) or should I update the expectations?
is issue-648-derive-debug-with-padding correct if targeting 1.47? if I target 1.47 it now derives Debug/Hash but I don't know if it should or not.