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Go package captcha implements generation and verification of image and audio CAPTCHAs.

Results 5 captcha issues
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add captcha redis storage adapter and example

It seems that there is no way to do this, though it would be helpful. I'd like to alert my users with "expired captcha" or "invalid captcha" instead of just...

feature
api change

Currently, `Server`, accepts `imgWidth` and `imgHeight`. I'd like to change it to accept a configuration struct to make it easier to expand it without API change: ``` type ServerConfig struct...

feature
api change

'memoryStore.collect()' may run concurrently, and we can return immediately when it is collecting by checking 'numStored' value.