fix: update soft block limit to 2MiB

This is needed because the 1MiB limit is the chunker limit, however the 
actual blocks can be wrapped in protobuf which adds a small ~10 byte 
overhead.

core/commands/cmdutils/utils.go

@@ -11,7 +11,7 @@ import (
 
 const (
 	AllowBigBlockOptionName = "allow-big-block"
-	SoftBlockLimit          = 1024 * 1024 // https://github.com/ipfs/go-ipfs/issues/7421#issuecomment-910833499
+	SoftBlockLimit          = 1024 * 1024 * 2 // https://github.com/web3-storage/web3.storage/pull/1269#issuecomment-1108834504
 )
 
 var AllowBigBlockOption cmds.Option
@@ -44,7 +44,7 @@ func CheckBlockSize(req *cmds.Request, size uint64) error {
 	// when transmitting them over BitSwap. The 1 MiB constant is an
 	// unenforced and undeclared rule of thumb hard-coded here.
 	if size > SoftBlockLimit {
-		return fmt.Errorf("produced block is over 1MiB: big blocks can't be exchanged with other peers. consider using UnixFS for automatic chunking of bigger files, or pass --allow-big-block to override")
+		return fmt.Errorf("produced block is over 2MiB: big blocks can't be exchanged with other peers. consider using UnixFS for automatic chunking of bigger files, or pass --allow-big-block to override")
 	}
 	return nil