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There are a couple of differences here due to using ICU: 1. Titlecasing behaves slightly differently. We previously transformed "123dollars" to "123Dollars", as we would use word segmentation to split a string into words, then transform the first cased character to titlecase. ICU doesn't go quite that far, and leaves the string as "123dollars". While this is a behavior change, the only user of this API is the `text-transform: capitalize;` CSS rule, and we now match the behavior of other browsers. 2. There isn't an API to compare strings with case insensitivity without allocating case-folded strings for both the left- and right-hand-side strings. Our implementation was previously allocation-free; however, in a benchmark, ICU is still ~1.4x faster.