My most recent posts have prompted a bit of discussion, and it seems some concern, regarding the implementation of Boolean values in Delphi. The concern at least I think is unwarranted, as long as you avoid explicitly comparing a Boolean value to the True constant and allow the compiler to logically evaluate the Boolean itself. But in the follow up investigations of one commenter (thank you Arthur), a further occurrence of the alternate -1 identity of True has been identified: Variants.
It has been observed that the Delphi documentation states that the constants True and False have the values 1 and 0 respectively, not the -1 and 0 that the default string conversions apply. This does actually make sense but also lays a trap for the unwary.
Jaap Van Goor was asking on FaceBook about some seemingly strange behaviour when obtaining string representations of Booleans using the Delphi RTL, which led me to revisit some familiar (and some not so familiar) old Delphi ground and take a look at the area involved in further detail.