[Issue 18267] Linker errors compiling std_data_json dub package with dmd 2.078.0

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18267

--- Comment #1 from anonymous4 <dfj1esp02 at sneakemail.com> ---
opEquals changes attributes based on debug switch? What if it's marked as
@safe?

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