about serialization of bn254 curve point

[nanne007]

Recently I'm working on a project which involved both halo2curves and arkworks.rs.
I found that the serialization of bn254 curve point like G1 are different in these two projects.
when serializing, halo2curves add the negative sign as the 6th bit of last bytes, and point of infinity as the 7th bit. see https://github.com/privacy-scaling-explorations/halo2curves/blob/a3f15e4106c8ba999ac958ff95aa543eb76adfba/src/derive/curve.rs#L138
while arkworks.rs does the opposite(6th for point of infinity, 7th for negative sign). see

algebra/ec/src/models/short_weierstrass/serialization_flags.rs

Line 7 in 860a986

pub enum SWFlags {

I had dealt the subtle difference in my project.
However, I wonder if there exists a common standard for (de)serialization Field and Curve Point?
If there isn't, I wonder how could we change the situation, and unify the serialization in many other zk projects and make proof parsing more portable?