[BUG] - Stringer types don't log the string representation

[betamos]

Describe the bug
I have types with useful string representations:

type ByteCount int // Note this could be a struct as well.

func (b ByteCount) String() string {
  // Returns a human readable string like "3.4MB"
}

With slog.TextHandler, their string representation is printed. With slog.JSONHandler, it's ignored (which is great).

However, with devslog they are not shown at all:

To Reproduce

slog.Info("stats", "mem", ByteCount(9503159))

Results in

 INFO  stats
# mem   : 9503159

Expected behavior

1. Substitute the value with the string representation, or...
2. Print the string representation as extra information:

 INFO  stats
# mem   : 9503159   "9.5MB"

Additional context

There are some variations to consider:

• The type is a struct. Should it be unpacked if there is a String method?
• The type also implements LogValuer, which should probably take precedence.

[david-littlefarmer]

Sorry for long silence.
I like the second proposal, here is solution: #32
LogValuer always take precedence.
I don't have solution for structs, yet.