RELNOTES: Minor optimisation of base64 serialization.
RELNOTES: Minor optimisation of base64 serialization.

PiperOrigin-RevId: 377393602
Change-Id: Icb1e5b3f19ce3d620b9f106445adc11d6683ed8c

google/closure-library,google/closure-library,google/closure-library,google/closure-library,google/closure-library