How does BCH counter transaction malleability?

In case of Bitcoin (BTC), they adopted Segregated Witness (SegWit). What I think is that BCH devs have solved the problem of transaction malleability on BCH chain too. But what approach dod they follow? Also wanted to ask: Is BCH really centralised due to low number of full nodes running? (what I think is that if BCH has adjustable blocks, so each block would only occupy the amount of size of transactions in it, not 32 MB everytime. So running a BCH node should be easy. But there exists only about 1500 BCH nodes running today in total, idk why)

submitted by /u/Nervous-Inspector-14
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source https://www.reddit.com/r/btc/comments/s5icsf/how_does_bch_counter_transaction_malleability/

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