ensureTotalCapacityContext

        pub fn ensureTotalCapacityContext(self: *Self, gpa: Allocator, new_capacity: usize, ctx: Context) Oom!void {
            self.pointer_stability.lock();
            defer self.pointer_stability.unlock();

            try self.entries.ensureTotalCapacity(gpa, new_capacity);
            if (new_capacity <= linear_scan_max) return;
            if (self.index_header) |header| if (new_capacity <= header.capacity()) return;

            const new_bit_index = try IndexHeader.findBitIndex(new_capacity);
            const new_header = try IndexHeader.alloc(gpa, new_bit_index);

            if (self.index_header) |old_header| old_header.free(gpa);
            self.insertAllEntriesIntoNewHeader(if (store_hash) {} else ctx, new_header);
            self.index_header = new_header;
        }