Constant VALUE_SIZE 

pub const VALUE_SIZE: usize = _; // 32usize

This test is to check if the size of Value exceeds the limit.

If the size exceeds the limit, you should box the variant. Previously, the size was 24. We bumped it to 32 such that String can be unboxed.

This value should never be raised as this is critical to stability in production, which can cause OOM or stack overflow for certain high throughput workloads.