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6dba1f1c8e
* `@truncate` builtin allows casting to the same size integer. It also performs two's complement casting between signed and unsigned integers. * The idiomatic way to convert between bytes and numbers is now `mem.readInt` and `mem.writeInt` instead of an unsafe cast. It works at compile time, is safer, and looks cleaner. * Implicitly casting an array to a slice is allowed only if the slice is const. * Constant pointer values know if their memory is from a compile- time constant value or a compile-time variable. * Cast from [N]u8 to []T no longer allowed, but [N]u8 to []const T still allowed. * Fix inability to pass a mutable pointer to comptime variable at compile-time to a function and have the function modify the memory pointed to by the pointer. * Add the `comptime T: type` parameter back to mem.eql. Prevents accidentally creating instantiations for arrays.