[Webkit-unassigned] [Bug 146131] New: Migrate break_lines.h to unsigned optionals

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=146131

            Bug ID: 146131
           Summary: Migrate break_lines.h to unsigned optionals
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mmaxfield at apple.com

Currently, we use ints with a -1 sentinel value. Instead, we should implement a special unsigned optional type which still uses -1 as its sentinel (because using a regular optional would cause a performance regression)

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