CamelCase matcher has a poor performance when completing word has a lot of upper case chars. In an extreme case it can fail to complete:
groovy-repl> setopt complete-matcher-camelcase
groovy-repl> VERY_LONG_SNAKE_CASE_VARIABLE='string'
groovy-repl> VERY_LONG_SNAKE_CASE_VARIABLE.toUpperCase()
STRING
groovy-repl> # fails to complete below...
groovy-repl> VERY_LONG_SNAKE_CASE_VARIABLE.tuc
CamelCase matcher has a poor performance when completing word has a lot of upper case chars. In an extreme case it can fail to complete: