lib.strings: deprecate lib.strings.{head,tail} #313144

Evaluator Performance Report

stat	before	after	Δ	Δ%
cpuTime	695.16	682.84	↘ 12.32	-1.77%
envs-bytes	21,025,964,600	21,025,964,600	0
envs-elements	1,107,163,235	1,107,163,235	0
envs-number	760,541,170	760,541,170	0
gc-heapSize	58,808,311,808	59,059,970,048	↗ 251,658,240	0.43%
gc-totalBytes	130,068,223,744	130,068,233,904	↗ 10,160	0.00%
list-bytes	3,669,235,712	3,669,235,712	0
list-concats	84,122,402	84,122,402	0
list-elements	458,654,464	458,654,464	0
nrAvoided	881,978,500	881,978,500	0
nrFunctionCalls	699,202,618	699,202,618	0
nrLookups	365,283,484	365,284,885	↗ 1,401	0.00%
nrOpUpdateValuesCopied	1,888,310,094	1,888,310,094	0
nrOpUpdates	86,322,468	86,322,468	0
nrPrimOpCalls	365,120,304	365,120,304	0
nrThunks	1,084,419,765	1,084,419,765	0
sets-bytes	42,882,353,104	42,882,353,104	0
sets-elements	2,518,118,839	2,518,118,839	0
sets-number	162,028,230	162,028,230	0
sizes-Attr	16	16	0
sizes-Bindings	16	16	0
sizes-Env	16	16	0
sizes-Value	24	24	0
symbols-bytes	2,469,518	2,469,518	0
symbols-number	172,340	172,340	0
values-bytes	33,393,059,568	33,393,059,568	0
values-number	1,391,377,482	1,391,377,482	0