Fix one of the astro segfaults, also fix bun init version (#4079)

* 4->16

* add assertions

* fix version stuff

1 files changed, 10 insertions, 3 deletions

diff --git a/src/string_immutable.zig b/src/string_immutable.zig
index 3aaec1314..fd5bcb00a 100644
--- a/src/string_immutable.zig
+++ b/src/string_immutable.zig
@@ -1480,9 +1480,12 @@ pub fn convertUTF16ToUTF8(list_: std.ArrayList(u8), comptime Type: type, utf16:
 pub fn toUTF8AllocWithType(allocator: std.mem.Allocator, comptime Type: type, utf16: Type) ![]u8 {
     if (bun.FeatureFlags.use_simdutf and comptime Type == []const u16) {
         const length = bun.simdutf.length.utf8.from.utf16.le(utf16);
-        // add 4 bytes of padding for SIMDUTF
-        var list = try std.ArrayList(u8).initCapacity(allocator, length + 4);
+        // add 16 bytes of padding for SIMDUTF
+        var list = try std.ArrayList(u8).initCapacity(allocator, length + 16);
         list = try convertUTF16ToUTF8(list, Type, utf16);
+        if (Environment.allow_assert) {
+            std.debug.assert(list.items.len == length);
+        }
         return list.items;
     }
 
@@ -1496,7 +1499,11 @@ pub fn toUTF8ListWithType(list_: std.ArrayList(u8), comptime Type: type, utf16:
         var list = list_;
         const length = bun.simdutf.length.utf8.from.utf16.le(utf16);
         try list.ensureTotalCapacityPrecise(length + 16);
-        return convertUTF16ToUTF8(list, Type, utf16);
+        const buf = try convertUTF16ToUTF8(list, Type, utf16);
+        if (Environment.allow_assert) {
+            std.debug.assert(buf.items.len == length);
+        }
+        return buf;
     }
 
     return toUTF8ListWithTypeBun(list_, Type, utf16);