Created by: sebastien-rosset
While running codegen under a Java profiler, I've noticed more than 80% of the time is spent in a very small number of functions that can be optimized with a cache:
- sanitize words
- underscore words
- camelize words
With a medium to large OpenAPI spec, I see the same function is called with the same arguments tens of millions of time, so there is a great opportunity to optimize performance.
This PR is purely a performance optimization, it does not change any output, as can be verified with no changes in the samples.
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