chore: add default for txtype (#1668) #5130

Job	Run time
docs	2m 1s
check no_std	53s
clippy	1m 25s
feature-checks	8m 37s
fmt	14s
test ubuntu-latest stable --no-default-features	2m 31s
doctest	3m 5s
test ubuntu-latest stable	2m 35s
wasm-unknown	2m 45s
test ubuntu-latest stable --all-features	3m 15s
wasm-wasi	3m 54s
test ubuntu-latest nightly --no-default-features	2m 33s
test ubuntu-latest nightly	2m 36s
test ubuntu-latest nightly --all-features	3m 5s
test ubuntu-latest 1.79 --no-default-features	1m 33s
test ubuntu-latest 1.79	1m 36s
test windows-latest stable --no-default-features	7m 39s
test windows-latest stable	6m 39s
test windows-latest stable --all-features	6m 25s
test windows-latest nightly --no-default-features	6m 41s
test windows-latest nightly	6m 45s
test windows-latest nightly --all-features	7m 31s
test windows-latest 1.79 --no-default-features	4m 20s
test windows-latest 1.79	4m 22s
ci success	4s
	1h 33m 4s

Provide feedback