[1986] Make ServiceMethod fail if parameters don't match arity

[gdaniel]

Bug: #1986

Fixes #1986

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[gdaniel]

I felt this improvement was too technical to add an entry in the release notes.
Let me know if I should add one.

[AxelRICHARD]

thank you!

[AxelRICHARD]

I felt this improvement was too technical to add an entry in the release notes. Let me know if I should add one.

You're absolutely right. Thank you!