Description:

In current piwik tracker, the 'setUserId' using 'isNumberOrHasLength' to check the 'userId'.

this.setUserId = function (userId) {
    if (isNumberOrHasLength(userId)) {
        configUserId = userId;
    }
};

while the 'getRequest' function using '(configUserId && configUserId.length)' to check the 'userId'.

((configUserId && configUserId.length) ? '&uid=' + encodeWrapper(configUserId) : '')

Which causing user can set a userId in number and verify it by 'getUserId' func, but the userId cannot be reported.

This PR is to solve this confusing thing.

Review

• Functional review done
• Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• Security review done see checklist
• Code review done
• Tests were added if useful/possible
• Reviewed for breaking changes
• Developer changelog updated if needed
• Documentation added if needed
• Existing documentation updated if needed