Function get_path_ref 

pub fn get_path_ref<'a>(
    root: &'a Value,
    path: &str,
    keyed_lists: &[KeyedList<'_>],
) -> DocumentResult<&'a Value>

Get a value at the given dot-path.

Handles:

• Object field access (any level of nesting)
• KeyedList access (Vec slug routing)
• Greedy key matching for keys containing ‘.’