triple equality for isEmpty
triple equality for isEmpty


Former-commit-id: a3b14dd60905afbba1e6b98b97263b2f0d14eab3 [formerly 32b639dd42ac0310da3a9ecaa51f6f6dc0e3694e]
Former-commit-id: c6cf24bcf8ecddbf701aa719517780353a8e8673
andrewplummer/Sugar,romancow/Sugar,andrewplummer/Sugar,romancow/Sugar