Remove deprecated filters: leaf_paths, recurse_down

src/builtin.jq

@@ -36,7 +36,6 @@ def map_values(f): .[] |= f;
 def recurse(f): def r: ., (f | r); r;
 def recurse(f; cond): def r: ., (f | select(cond) | r); r;
 def recurse: recurse(.[]?);
-def recurse_down: recurse;
 
 def to_entries: [keys_unsorted[] as $k | {key: $k, value: .[$k]}];
 def from_entries: map({(.key // .Key // .name // .Name): (if has("value") then .value else .Value end)}) | add | .//={};
@@ -62,7 +61,6 @@ def strings: select(type == "string");
 def nulls: select(. == null);
 def values: select(. != null);
 def scalars: select(type|. != "array" and . != "object");
-def leaf_paths: paths(scalars);
 def join($x): reduce .[] as $i (null;
             (if .==null then "" else .+$x end) +
             ($i | if type=="boolean" or type=="number" then tostring else .//"" end)