Blur(0.0) is a no-op. The code is optimised and just returns the input clip.
Regarding GaussianBlur, it depends what sort of effect you want. The range of Blur() is limited to 1.58 and even repeating this has a limited effect, so if you want to blur more you have to use a gaussian.
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GScript and GRunT - complex Avisynth scripting made easier
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