Now, by default, unpacking doesn't check that all array and object items are accessed. The check can be enabled globally by using the JSON_STRICT flag (formerly JSON_UNPACK_ONLY), or on a per-value basis by using the new '!' format character. The '*' format character is still available to disable the global check on a per-value basis.
To build the documentation, invoke
make html
Then point your browser to _build/html/index.html.