Replaces identical array elements with integer component indices (with optional level and label rules)
ArrayComponents[array]
ArrayComponents[array, level]
ArrayComponents[array, level, rules]
ArrayComponents[{8, 2.5, 7, 8}]
→ {1, 2, 3, 1}ArrayComponents[{{True, False}, x, {10, 10}, {True, x, {False}}}]
→ {{1, 2}, 3, {4, 4}, {1, 3, {2}}}