Which type of value can I use for my parameters?

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Event parameter can be string or number. 

If you send a boolean value or NaN as a parameter value, these values will be converted to string ‘true’, ‘false’ or ‘nan’, respectively.

If a parameter has undefined or null value, this parameter will be ignored. You won’t be able to view it in GA DebugView panel or in a BigQuery export.

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