refactor(v2): use faster hasher to optimize

[fu050409]

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[wre232114]

You can rename FxHashMap to HashMap and reexport them at the place. So all usage will not be changed, also it's easy to update the hash implementation in the future

[fu050409]

Infact, even though I create a alias for FxHashMap and named it farm_core::HashMap, the type check is not match. This means that althought our usage looks same, all the codes depend on these apis should be refactored. @wre232114 Is this acceptable? 😊

[wre232114]

yeah, it's fine

[wre232114]

can we add a new() method for the faster hashmap, then we don't need to replace all the new() to default()

[fu050409]

can we add a new() method for the faster hashmap, then we don't need to replace all the new() to default()

I'm afraid not. The method new() is provided by the Rust standard library. And in soruce code, it is:

#[inline]
#[must_use]
#[stable(feature = "rust1", since = "1.0.0")]
pub fn new() -> HashMap<K, V, RandomState> {
    Default::default()
}

As we can see, this method is for HashMap with RandomState so it's not implemented for FxHashBuilder.

Otherwise, we cannout define inherent impl for foreign type.