Provide specs from behaviour for local buffer code #341

Job	Run time
static analysis (Elixir 1.15.x \| Erlang/OTP 26.x)	3m 19s
mix test windows (Elixir 1.13.x \| Erlang/OTP 22.x)	2m 7s
mix test windows (Elixir 1.13.x \| Erlang/OTP 23.x)	2m 43s
mix test windows (Elixir 1.13.x \| Erlang/OTP 24.x)	3m 28s
mix test windows (Elixir 1.13.x \| Erlang/OTP 25.x)	2m 15s
mix test windows (Elixir 1.14.x \| Erlang/OTP 23.x)	2m 20s
mix test windows (Elixir 1.14.x \| Erlang/OTP 24.x)	2m 57s
mix test windows (Elixir 1.14.x \| Erlang/OTP 25.x)	2m 21s
mix test windows (Elixir 1.14.x \| Erlang/OTP 26.x)	2m 25s
mix test windows (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 58s
mix test windows (Elixir 1.15.x \| Erlang/OTP 25.x)	2m 49s
mix test windows (Elixir 1.15.x \| Erlang/OTP 26.x)	2m 3s
mix test (Elixir 1.13.x \| Erlang/OTP 22.x)	1m 7s
mix test (Elixir 1.13.x \| Erlang/OTP 23.x)	1m 14s
mix test (Elixir 1.13.x \| Erlang/OTP 24.x)	1m 9s
mix test (Elixir 1.13.x \| Erlang/OTP 25.x)	1m 14s
mix test (Elixir 1.14.x \| Erlang/OTP 23.x)	1m 18s
mix test (Elixir 1.14.x \| Erlang/OTP 24.x)	1m 27s
mix test (Elixir 1.14.x \| Erlang/OTP 25.x)	1m 21s
mix test (Elixir 1.14.x \| Erlang/OTP 26.x)	1m 41s
mix test (Elixir 1.15.x \| Erlang/OTP 24.x)	1m 20s
mix test (Elixir 1.15.x \| Erlang/OTP 25.x)	1m 13s
mix test (Elixir 1.15.x \| Erlang/OTP 26.x)	1m 6s
	44m 55s

Provide feedback