Message
Non-boolean value for AdultContent: foo
Explanation
The values "false", "FALSE", "0", "no", and "NO" will be considered boolean FALSE; all other strings will be considered boolean TRUE.
Solution
If you intended to specify a FALSE value, pick one of the values above (case sensitive).
Otherwise, for consistency, and in order to prevent misinterpretations, use of one of the following values is suggested: "true", "TRUE", "1", "yes", and "YES"
Not clear? Disagree?
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