fn ensureTotalLength(self: *Wip, new_len: usize) Allocator.Error!void
self: *Wip
new_len: usize
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fn ensureTotalLength(self: *Wip, new_len: usize) Allocator.Error!void { try self.maps.appendNTimes( .{}, std.math.sub(usize, new_len, self.maps.items.len) catch return, ); }