Confused about construct domain

Hello, can you please explain why a construct domain with a start value of .5 and an end value of 2 with an x-1 component shows a .5 result as shown on the image? thanks

the x-1 component expects a single number as input.
grasshopper does a lot of casting under the hood.
the domain spans from 0.5 .. 2.0 therefor it spans 1.5
looks like the casting is using the domain length

yep … looks like that s the way a domain is casted to a number / float

kind regards -tom

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Thanks a lot, regards