Question

An optimized version of Sequence#first that returns another StringLikeSequence (or just the first character, if count is undefined).

Examples

Lazy('foo').first()                // => 'f'
Lazy('fo').first(2)                // sequence: 'fo'
Lazy('foo').first(10)              // sequence: 'foo'
Lazy('foo').toUpperCase().first()  // => 'F'
Lazy('foo').toUpperCase().first(2) // sequence: 'FO'