refactor(fmt): Use operator<< instead of explict to_string() (2nd)

apache / incubator-pegasus

Apache Pegasus - A horizontally scalable, strongly consistent and high-performance key-value store

https://pegasus.apache.org/

Apache License 2.0

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Closed acelyc111 closed 7 months ago

acelyc111 commented 8 months ago

There is no functional changes, but only refactor to simplify the code.