Name
  annot:SetGrayColor -- set gray color
Synopsis

      status = annot:SetGrayColor(gray)

Function
  This method is currently undocumented in libHaru. Complain to the libHaru authors.

  The `gray` parameter must be between 0 and 1.

  Returns `#HPDF_OK` on success. Otherwise, returns an error code and the error handler is invoked.

Inputs
  gray
    gray color
Results
  status
    status code

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