While a double opening quote without a closing one is reported, a single is not. How come?
The check is not very simple, I know, because:
's is allowed as a valid sentence start (for Dutch).
’ at the start can be matched by a quote within the sentence or within the paragraph.
’ within the sentence should be matched within the sentence.
's Ochtends is het koud.
's Ochtends is het ‘koud’.
‘Het is koud.’
‘Het is koud’, zei ze.
‘Het is koud. Maar het vriest niet.’