Vtc.Timecode.with_seconds-exclamation-mark

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

with_seconds!(seconds, rate)

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Specs

with_seconds!(Vtc.Sources.Seconds.t(), Vtc.Framerate.t()) :: t()

As Vtc.Timecode.with_seconds/2, but raises on error.