Add a generic, simple reduce/merge deep addition of object with numbers

src/util/reduce-merge-deep-add.sh

@@ -0,0 +1,23 @@
+#!/usr/bin/env bash
+set -e
+
+read -d '' reduceMerge <<-'EOF' || true
+def deepAdd(item):
+	item as $item
+	| with_entries(
+		($item[.key]) as $other
+		| if (.value | type) == "number" and ($other | type) == "number" then
+			.value += $other
+		else
+			.value |= deepAdd($other)
+		end
+	);
+
+reduce .[1:][] as $halfway
+(
+	.[0];
+	deepAdd($halfway)
+)
+EOF
+
+cat | jq --slurp "$reduceMerge"