fix invalid cache length when set with zero value key (#24) #345

	name: memory

	on:
	pull_request:
	paths-ignore:
	- README.md
	schedule:
	- cron: '0 0 * * *'
	push:
	branches:
	- master

	jobs:
	memory:
	runs-on: ubuntu-latest
	steps:
	- name: Install packages
	run: sudo apt update -y && sudo apt-get install -y csvkit datamash
	- uses: actions/setup-go@v5
	with:
	go-version: '1.23.2'
	check-latest: true
	- uses: actions/checkout@v4
	- name: go mod tidy
	run: \|
	mkdir bench
	cd bench
	awk '{if($0 ~ "// memusage.go"){a=1;b=1};if($0 ~ "```" && b=1){b=0};if (a&&b) {print}}' ../README.md > memusage.go
	go mod init bench
	go mod tidy
	go mod edit -replace github.com/phuslu/lru=../
	cat go.mod
	- name: Memory Tests
	working-directory: ./bench
	run: \|
	echo -e 'MemStats\tCacheSize\tAlloc\tTotalAlloc\tSys' > memusage.txt
	for name in nottl phuslu lxzan ristretto freelru ecache otter theine cloudflare ccache hashicorp; do
	for cachesize in 100000 200000 400000 1000000 2000000 4000000; do
	go run memusage.go $name $cachesize >> memusage.txt
	done
	done
	cat memusage.txt
	- name: Memory Results
	working-directory: ./bench
	run: \|
	cat memusage.txt \| datamash --header-in crosstab 1,2 unique 3 \| tee >(head -1) \| tail -n +2 \| sort -k12 -n \| datamash transpose \| tee >(head -1) \| tail -n +2 \| sort -n \| datamash transpose \| csvlook

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