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As you can see in the quote from the whitepaper the Triggers were initially planned to be represented as ISI.
But with the recent decision to introduce WASM, it is suggested to use it for Triggers. So that Triggers can be written in Rust* and compiled into WASM.
This way Triggers will benefit from a high level language features of an already established language and will be able to solve all the listed use cases with ease.
As discussed previously, solving listed use cases with ISI was impossible or very difficult and needed significant work on the language design side.
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