Unit text-bytes assume=exact

note: before

BenchmarkSize 1 100 text-bytes

BenchmarkNonExact 1 100 text-bytes
BenchmarkNonExact 1 101 text-bytes
BenchmarkNonExact 1 101 text-bytes

note: after

BenchmarkSize 1 105 text-bytes

BenchmarkNonExact 1 101 text-bytes
BenchmarkNonExact 1 101 text-bytes
BenchmarkNonExact 1 101 text-bytes