Deserialize bigint as strings

Currently im not able to deserialize json with big integers, 
when json contains
{ 'big-int': 1000007546090751}
its deserialized as '1.0000076544307E+15'

I added flag JSON_BIGINT_AS_STRING to json_decode. I could be somewhere defined as configuration but i dont see reason why not to use it globaly for lib?