Inconsistent Message operator resolution behaviour

[antvaset]

I've noticed that Message(1, null, '1', 'Message', 'This is a message') (the second argument is null) fails to translate inside of this library:

library TestLib version '1.0.0'

define y: Message(1, null, '1', 'Message', 'This is a message')

and gives Could not resolve call to operator Message with signature (System.Integer,System.Any,System.String,System.String,System.String).

If I add Message(1, false, '1', 'Message', 'This is a message') or Message(1, null as Boolean, '1', 'Message', 'This is a message') (the second argument is of type System.Boolean) to the same library prior to calling Message with null, it compiles successfully, e.g. both of these compile and run successfully:

library TestLib version '1.0.0'

define x: Message(1, false, '1', 'Message', 'This is a message')
define y: Message(1, null, '1', 'Message', 'This is a message')

and

library TestLib version '1.0.0'

define y: Message(1, null as Boolean, '1', 'Message', 'This is a message') + Message(1, null, '1', 'Message', 'This is a message')