Why does the code here need to be written using ternary judgment in Vuex3 store.js dispatch method

[miyagipipi]

const result = entry.length > 1 ? Promise.all(entry.map(handler => handler(payload))) : entry[0](payload)
In Vuex3 /src/store.js dispatch method.
I saw this source code before and thought it was specifically optimized, for example, when entry.length === 1, using Promise.all() would require more resources than entry[0](payload). But I think the cost difference between the two should be negligible when entry.length === 1.
So I want to know why ternary judgment is specifically used here, instead of directly using Promise.all() method?