Tracelog truncation can make output longer.

[ecordell]

This is a pretty small nitpick, but I noticed:

pgx/tracelog/tracelog.go

Line 101 in ea9610f

a = fmt.Sprintf("%x (truncated %d bytes)", v[:64], len(v)-64)

The message indicating truncation can take up more space than the number of bytes being removed - i.e. if you commonly have values of 65 bytes, it will truncate 1 byte but print out an extra (truncated 1 bytes), which is 20 more bytes. Maybe changing this can be rolled into a solution for #998