Vtc.Framerate.new-exclamation-mark

You're seeing just the function new-exclamation-mark, go back to Vtc.Framerate module for more information.
Link to this function

new!(rate, ntsc, coerce_seconds_per_frame? \\ true)

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Specs

new!(Vtc.Utils.Rational.t() | float() | String.t(), ntsc(), boolean()) :: t()

As new/2 but raises an error instead.