Passing numerical data from one photon to another

I would like to pass numerical data from several photons to a single photon where the data is compiled and displayed. subscribe/publish only passes strings/char. I am sure there is a reason why numericals are not supported but sure would be helpful it it did. So what is the best way to pass numericals?

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Convert them to/from a String?

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yea that was the conclusion I came to thanks