Don't capitalize the word after a decimal point in sentence case

Found while testing crates/model/src/edit.rs:~505 (change_case_parts, sentence branch)

Co-Authored-By: Claude Haiku 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

crates/model/src/edit.rs

@@ -498,6 +498,11 @@ pub fn next_case(s: &str) -> &'static str {
     }
 }
 
+/// Whether the `.` at `i` sits between two ASCII digits (a decimal point or version number).
+fn is_decimal_point(all: &[char], i: usize) -> bool {
+    i > 0 && all[i - 1].is_ascii_digit() && all.get(i + 1).is_some_and(|n| n.is_ascii_digit())
+}
+
 /// Change case: `upper`, `lower`, `sentence`, `title`, `toggle`.
 pub fn change_case(s: &str, mode: &str) -> String {
     change_case_parts(&[s], mode).concat()
@@ -532,7 +537,7 @@ pub fn change_case_parts(parts: &[&str], mode: &str) -> Vec<String> {
                     } else {
                         out.extend(c.to_lowercase());
                     }
-                    if (title && c.is_whitespace()) || (!title && matches!(c, '.' | '!' | '?')) {
+                    if (title && c.is_whitespace()) || (!title && matches!(c, '.' | '!' | '?') && !(c == '.' && is_decimal_point(&all, i))) {
                         start = true;
                     }
                 }
@@ -558,6 +563,13 @@ mod tests {
         assert_eq!(change_case("ΟΔΟΣ", "lower"), "οδος");
     }
 
+    #[test]
+    fn sentence_case_decimal_point_is_not_a_boundary() {
+        assert_eq!(change_case("I HAVE 3.5 APPLES", "sentence"), "I have 3.5 apples");
+        assert_eq!(change_case_parts(&["V 1.", "2 BETA"], "sentence").concat(), "V 1.2 beta");
+        assert_eq!(change_case("HELLO. WORLD", "sentence"), "Hello. World");
+    }
+
     #[test]
     fn title_sigma_across_runs_is_not_final() {
         assert_eq!(change_case_parts(&["ΟΔΟΣ", "ΑΣ"], "title"), ["Οδοσ", "ας"]);