./u4builder_demo
=== u4builder test ===

Hello, мир!
Numbers: 1 2 3 4 5

[1] event line
[2] event line
[3] event line
[4] event line
[5] event line
[6] event line
[7] event line
[8] event line
[9] event line
[10] event line

Count (chars): 183
Capacity:      256

Append 100000 chars: 30.00 ms
Result length: 100000

String concat 10000 chars: 125.00 ms

Done.
