fix default value for \round #2145

Job	Run time
Run cs-fixer and stubs structure tests	7m 48s
Run tests against php 5.6	7m 56s
Run tests against php 7.0	8m 54s
Run tests against php 7.1	9m 31s
Run tests against php 7.2	9m 37s
Run tests against php 7.3	9m 55s
Run tests against php 7.4	9m 54s
Run tests against php 8.0	12m 6s
Run tests against php 8.1	12m 10s
Run tests against php 8.2	12m 2s
Run tests against php 8.3	11m 41s
Run tests against php 8.4	12m 53s
	2h 4m 27s

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