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Add formspec parameters #1652
Having this built in would act as a helper to mod development. It is already done by a lot of mods which all implement their own methods.
Here is an example of implementing it using a Lua mod, however it is hacky:
Hidden fields seem like they would add otherwise preventable options for a manipulated client to change formspec submit outcome.
Like a financial transaction formspec, that might serverside be bound to one source account via parameters might instead be manipulated with hidden forms to let other players pay for oneself.