Range constructor
Implementation
const Range({required this.start, this.limit})
: assert(start >= 0, 'Start index must be >= 0.'),
assert(limit == null || limit >= 0, 'Limit must be null or >= 0.');
const Range({required this.start, this.limit})
: assert(start >= 0, 'Start index must be >= 0.'),
assert(limit == null || limit >= 0, 'Limit must be null or >= 0.');