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May 6, 2016 at 21:20
Smalltalk has separate True and False classes. Strictly following 'everything is OO', it makes sense: eg different 'not' implementations!

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Dec 18, 2022 at 07:51
I'm slightly surprised that Rust has implemented the Default trait for booleans: https://doc.rust-lang.org/src/core/default.rs.html#205 The default is false, but it feels very arbitrary. Maybe it makes more sense next to integers, where the default value is 0.
default.rs - source
Source of the Rust file `library/core/src/default.rs`.
Nov 30, 2019 at 11:15
PHP is adding union types, and even has a 'false' type to clarify the possible return values from built in functions!
PHP: rfc:union_types_v2
May 25, 2019 at 00:04
It's amazing to me that Smalltalk has only six reserved words: nil, true, false, self, super and thisContext. When you go all-in on a unifying principle you can really keep the language small.