wamp - Why did upgrading WAMPServer's PHP from 7.3.12 to 7.4.0 cause Argon2i error?
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Solution:
I finally found https://magento.stackexchange.com/a/331992 , which is about Magento, which is unrelated to anything I'm using, but it hints that I'm missing the Sodium PHP extension.
Enabling "sodium" in WAMP's extensions fixed it for me:
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