Per-iteration scope passed to handlers triggered inside a data-each.
Carries the loop variable (named by data-as, defaulting to item),
index / $index / $first / $last / $path, and any outer
scope variables from a parent data-each. Pass it to setValue-style
helpers via the engine's resolvers, or read it directly for custom
routing decisions.
Per-iteration scope passed to handlers triggered inside a
data-each. Carries the loop variable (named bydata-as, defaulting toitem),index/$index/$first/$last/$path, and any outer scope variables from a parentdata-each. Pass it tosetValue-style helpers via the engine's resolvers, or read it directly for custom routing decisions.