Give NullParameter a friendly string representation #947
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Otherwise stringifying it results in random output like `com.twitter.finagle.mysql.Parameter$NullParameter$@5550f534`. This doesn't work well with e.g. snapshot tests.
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Otherwise stringifying it results in random output like
com.twitter.finagle.mysql.Parameter$NullParameter$@5550f534.This doesn't work well with e.g. snapshot tests.