sha256: base32 VS nix-base32

[HiPhish]

When using `guix download` and `guix hash` there are (among other) the formats 
`nix-base32` and `base32`. It appears that when writing a package definition I 
have to use the former with the `(base32 "...")` expression. This really 
confused be because I thought that "base32" means "base32" on both sides. What 
is the deal with this?