PHOTON: RPC's thinking a string[] with only one string IS that string!

if an RPC has as a string[ ] parameter (variable length array) and the string[ ] parameter used when calling it has exactly one element… then the RPC will NOT recognize it as a string array… and thinks it must use an NPC with a ‘string’ parameter in that place instead… (i.e… not a string array but just a single string)…
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if the string[ ] parameter has 2 or more elements it recognizes the parameter just fine… only when it has exactly one element is this a problem… i have not yet tested the zero-element string array or null cases…
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this is obviously a bug… i can’t see how this could possibly be a working-as-intended feature… a bug which has not been fixed in many years…

and yes… i know this belongs more in a PHOTON forum… and Unity is not the cause (i don’t think)… but i feel mentioning this ‘quirk’ belongs here too… since it can be the source of a lot of heartache…

I think you need to work around this by explicitly passing an object[ ] to the parameters of the RPC method.
Along these lines: new object[ ] { string[ ] yourStringArrayWithOneItem }.
The quirk is (afaik) in our use of params object[ ] parameters as last parameter. It does not “get” your string[ ] is meant to be the first entry in the object[ ], instead of being the parameters array.