static constexpr int64_t ram_gift_bytes = 1400;
1. <eosio.system>

2. static constexpr

3. Function buyram
3.1. inside function buyram and add update_ram_supply()

3.2. N(eosio.ram), N(active)

3.3. set_resource_limits(res_itr->ram_bytes)
ram_gift_bytes
4. Function sellram
4.1 changebw(from, receiver, stake_net_delta, stake_cpu_delta, bool transfer)


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