A default constructed IntervalVar can be used to mean not defined yet.
However, it shouldn't be passed to any of the functions in this file.
Doing so will crash in debug mode and will result in an invalid model in
opt mode.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-08-06 UTC."],[[["`IntervalVar` represents an interval constraint within the CP-SAT solver, defining a period with a start, end, and size."],["It provides methods to access and manipulate the start, end, and size of the interval, expressed as linear expressions."],["Users can query the interval's presence, name, debug string, and index within the model."],["A default-constructed `IntervalVar` is considered undefined and should not be used in constraint creation."]]],[]]