Fix splines becoming linear when duplicated. #426
Merged
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When used in
spline { SPLINE_IDENTIFIER ... }without explicitly specifying spline type again, the new copy would get demoted tolinear_spline(see newsgroup post<XnsAD687938A665Aseed7@news.povray.org>, 2021-07-15, povray.beta-test, "spline in, out array bug").