JSON encoding for values embedded in Alpine attributes.

:jason is a hard dependency of this library, so encode!/1 normally delegates straight to it. The fallback chain exists only so that an application which has deliberately swapped in Poison still works, and so that the failure — if somehow neither is present — is a clear message rather than an UndefinedFunctionError raised from inside a template.

Prior to v0.2.0 the library called Jason.encode!/1 and Poison.encode!/1 directly while declaring both as optional dependencies, which meant any consumer without them crashed at render time.