That blog post treats Jackson as the de facto standard Java JSON parser/formatter which seems reasonable.

That's bit much - (unfortunately) the codebase uses at least 4 different json libraries (perhaps 5 if I consider one non-general purpose, personally written). gson is generally very popular as well. The blog post mentions BigDecimal and at that point, I'd not dare to trust it much.

The de-facto standard is similar to the expectation everyone uses spring boot.