Revert "Block package Shimuuar/fixed-vector-hetero#3"
Revert "Block package Shimuuar/fixed-vector-hetero#3"

This reverts commit d02117d5b3fe3468507f4d6eb1131bd2c90a0895.

simonmichael/stackage,garetxe/stackage,creichert/stackage,mstksg/stackage,Shimuuar/stackage,spencerjanssen/stackage,phaazon/stackage,soenkehahn/stackage,jonschoning/stackage,athanclark/stackage,wereHamster/stackage,k0ral/stackage,lwm/stackage,asr/stackage,mgajda/stackage,massysett/stackage,mrkkrp/stackage,int-index/stackage,michalkonecny/stackage,iand675/stackage,peti/stackage,ethercrow/stackage,ygale/stackage,fpco/stackage,Daniel-Diaz/stackage,fimad/stackage,GregorySchwartz/stackage,stackbuilders/stackage,clinty/stackage