fix(fs): fix mergefs bug where files were opened too many times

[hairyhenderson]

Fixes #2273 by ensuring that each sub-file is only opened once.

[github-actions]

Benchmark

Benchmark suite	Current: 1c402b4	Previous: 66fd58b	Ratio
BenchmarkFlatten/depth-1_[]int([1_2_3])	179.6 ns/op 168 B/op 5 allocs/op	165.7 ns/op 168 B/op 5 allocs/op	1.08
BenchmarkFlatten/depth-1_[]int([1_2_3]) - ns/op	179.6 ns/op	165.7 ns/op	1.08
BenchmarkFlatten/depth-1_[]int([1_2_3]) - B/op	168 B/op	168 B/op	1
BenchmarkFlatten/depth-1_[]int([1_2_3]) - allocs/op	5 allocs/op	5 allocs/op	1
BenchmarkFlatten/depth-1_[3]int([1_2_3])	118 ns/op 144 B/op 2 allocs/op	117.2 ns/op 144 B/op 2 allocs/op	1.01
BenchmarkFlatten/depth-1_[3]int([1_2_3]) - ns/op	118 ns/op	117.2 ns/op	1.01
BenchmarkFlatten/depth-1_[3]int([1_2_3]) - B/op	144 B/op	144 B/op	1
BenchmarkFlatten/depth-1_[3]int([1_2_3]) - allocs/op	2 allocs/op	2 allocs/op	1
BenchmarkFlatten/depth-1_[]interface_{}([[]_[1_2]_3])	215.4 ns/op 208 B/op 5 allocs/op	203.4 ns/op 208 B/op 5 allocs/op	1.06
BenchmarkFlatten/depth-1_[]interface_{}([[]_[1_2]_3]) - ns/op	215.4 ns/op	203.4 ns/op	1.06
BenchmarkFlatten/depth-1_[]interface_{}([[]_[1_2]_3]) - B/op	208 B/op	208 B/op	1
BenchmarkFlatten/depth-1_[]interface_{}([[]_[1_2]_3]) - allocs/op	5 allocs/op	5 allocs/op	1
BenchmarkFlatten/depth-1_[]interface_{}([[one]_[[1_2]]_3])	428.1 ns/op 344 B/op 11 allocs/op	422.8 ns/op 344 B/op 11 allocs/op	1.01
BenchmarkFlatten/depth-1_[]interface_{}([[one]_[[1_2]]_3]) - ns/op	428.1 ns/op	422.8 ns/op	1.01
BenchmarkFlatten/depth-1_[]interface_{}([[one]_[[1_2]]_3]) - B/op	344 B/op	344 B/op	1
BenchmarkFlatten/depth-1_[]interface_{}([[one]_[[1_2]]_3]) - allocs/op	11 allocs/op	11 allocs/op	1
BenchmarkFlatten/depth-1_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6])	802.9 ns/op 896 B/op 19 allocs/op	791.2 ns/op 896 B/op 19 allocs/op	1.01
BenchmarkFlatten/depth-1_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - ns/op	802.9 ns/op	791.2 ns/op	1.01
BenchmarkFlatten/depth-1_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - B/op	896 B/op	896 B/op	1
BenchmarkFlatten/depth-1_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - allocs/op	19 allocs/op	19 allocs/op	1
BenchmarkFlatten/depth0_[]int([1_2_3])	117.9 ns/op 72 B/op 4 allocs/op	114.2 ns/op 72 B/op 4 allocs/op	1.03
BenchmarkFlatten/depth0_[]int([1_2_3]) - ns/op	117.9 ns/op	114.2 ns/op	1.03
BenchmarkFlatten/depth0_[]int([1_2_3]) - B/op	72 B/op	72 B/op	1
BenchmarkFlatten/depth0_[]int([1_2_3]) - allocs/op	4 allocs/op	4 allocs/op	1
BenchmarkFlatten/depth0_[3]int([1_2_3])	64.87 ns/op 48 B/op 1 allocs/op	63.74 ns/op 48 B/op 1 allocs/op	1.02
BenchmarkFlatten/depth0_[3]int([1_2_3]) - ns/op	64.87 ns/op	63.74 ns/op	1.02
BenchmarkFlatten/depth0_[3]int([1_2_3]) - B/op	48 B/op	48 B/op	1
BenchmarkFlatten/depth0_[3]int([1_2_3]) - allocs/op	1 allocs/op	1 allocs/op	1
BenchmarkFlatten/depth0_[]interface_{}([[]_[1_2]_3])	4.333 ns/op 0 B/op 0 allocs/op	4.33 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkFlatten/depth0_[]interface_{}([[]_[1_2]_3]) - ns/op	4.333 ns/op	4.33 ns/op	1.00
BenchmarkFlatten/depth0_[]interface_{}([[]_[1_2]_3]) - B/op	0 B/op	0 B/op	1
BenchmarkFlatten/depth0_[]interface_{}([[]_[1_2]_3]) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkFlatten/depth0_[]interface_{}([[one]_[[1_2]]_3])	4.331 ns/op 0 B/op 0 allocs/op	4.442 ns/op 0 B/op 0 allocs/op	0.98
BenchmarkFlatten/depth0_[]interface_{}([[one]_[[1_2]]_3]) - ns/op	4.331 ns/op	4.442 ns/op	0.98
BenchmarkFlatten/depth0_[]interface_{}([[one]_[[1_2]]_3]) - B/op	0 B/op	0 B/op	1
BenchmarkFlatten/depth0_[]interface_{}([[one]_[[1_2]]_3]) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkFlatten/depth0_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6])	4.339 ns/op 0 B/op 0 allocs/op	4.301 ns/op 0 B/op 0 allocs/op	1.01
BenchmarkFlatten/depth0_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - ns/op	4.339 ns/op	4.301 ns/op	1.01
BenchmarkFlatten/depth0_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - B/op	0 B/op	0 B/op	1
BenchmarkFlatten/depth0_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkFlatten/depth1_[]int([1_2_3])	172.3 ns/op 168 B/op 5 allocs/op	166.1 ns/op 168 B/op 5 allocs/op	1.04
BenchmarkFlatten/depth1_[]int([1_2_3]) - ns/op	172.3 ns/op	166.1 ns/op	1.04
BenchmarkFlatten/depth1_[]int([1_2_3]) - B/op	168 B/op	168 B/op	1
BenchmarkFlatten/depth1_[]int([1_2_3]) - allocs/op	5 allocs/op	5 allocs/op	1
BenchmarkFlatten/depth1_[3]int([1_2_3])	116.8 ns/op 144 B/op 2 allocs/op	116.9 ns/op 144 B/op 2 allocs/op	1.00
BenchmarkFlatten/depth1_[3]int([1_2_3]) - ns/op	116.8 ns/op	116.9 ns/op	1.00
BenchmarkFlatten/depth1_[3]int([1_2_3]) - B/op	144 B/op	144 B/op	1
BenchmarkFlatten/depth1_[3]int([1_2_3]) - allocs/op	2 allocs/op	2 allocs/op	1
BenchmarkFlatten/depth1_[]interface_{}([[]_[1_2]_3])	160.5 ns/op 144 B/op 4 allocs/op	157.9 ns/op 144 B/op 4 allocs/op	1.02
BenchmarkFlatten/depth1_[]interface_{}([[]_[1_2]_3]) - ns/op	160.5 ns/op	157.9 ns/op	1.02
BenchmarkFlatten/depth1_[]interface_{}([[]_[1_2]_3]) - B/op	144 B/op	144 B/op	1
BenchmarkFlatten/depth1_[]interface_{}([[]_[1_2]_3]) - allocs/op	4 allocs/op	4 allocs/op	1
BenchmarkFlatten/depth1_[]interface_{}([[one]_[[1_2]]_3])	220.4 ns/op 168 B/op 5 allocs/op	210.8 ns/op 168 B/op 5 allocs/op	1.05
BenchmarkFlatten/depth1_[]interface_{}([[one]_[[1_2]]_3]) - ns/op	220.4 ns/op	210.8 ns/op	1.05
BenchmarkFlatten/depth1_[]interface_{}([[one]_[[1_2]]_3]) - B/op	168 B/op	168 B/op	1
BenchmarkFlatten/depth1_[]interface_{}([[one]_[[1_2]]_3]) - allocs/op	5 allocs/op	5 allocs/op	1
BenchmarkFlatten/depth1_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6])	145.1 ns/op 128 B/op 3 allocs/op	140.6 ns/op 128 B/op 3 allocs/op	1.03
BenchmarkFlatten/depth1_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - ns/op	145.1 ns/op	140.6 ns/op	1.03
BenchmarkFlatten/depth1_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - B/op	128 B/op	128 B/op	1
BenchmarkFlatten/depth1_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - allocs/op	3 allocs/op	3 allocs/op	1
BenchmarkFlatten/depth2_[]int([1_2_3])	183.6 ns/op 168 B/op 5 allocs/op	166.3 ns/op 168 B/op 5 allocs/op	1.10
BenchmarkFlatten/depth2_[]int([1_2_3]) - ns/op	183.6 ns/op	166.3 ns/op	1.10
BenchmarkFlatten/depth2_[]int([1_2_3]) - B/op	168 B/op	168 B/op	1
BenchmarkFlatten/depth2_[]int([1_2_3]) - allocs/op	5 allocs/op	5 allocs/op	1
BenchmarkFlatten/depth2_[3]int([1_2_3])	116.3 ns/op 144 B/op 2 allocs/op	116.9 ns/op 144 B/op 2 allocs/op	0.99
BenchmarkFlatten/depth2_[3]int([1_2_3]) - ns/op	116.3 ns/op	116.9 ns/op	0.99
BenchmarkFlatten/depth2_[3]int([1_2_3]) - B/op	144 B/op	144 B/op	1
BenchmarkFlatten/depth2_[3]int([1_2_3]) - allocs/op	2 allocs/op	2 allocs/op	1
BenchmarkFlatten/depth2_[]interface_{}([[]_[1_2]_3])	207 ns/op 208 B/op 5 allocs/op	203.9 ns/op 208 B/op 5 allocs/op	1.02
BenchmarkFlatten/depth2_[]interface_{}([[]_[1_2]_3]) - ns/op	207 ns/op	203.9 ns/op	1.02
BenchmarkFlatten/depth2_[]interface_{}([[]_[1_2]_3]) - B/op	208 B/op	208 B/op	1
BenchmarkFlatten/depth2_[]interface_{}([[]_[1_2]_3]) - allocs/op	5 allocs/op	5 allocs/op	1
BenchmarkFlatten/depth2_[]interface_{}([[one]_[[1_2]]_3])	379.2 ns/op 280 B/op 10 allocs/op	368.6 ns/op 280 B/op 10 allocs/op	1.03
BenchmarkFlatten/depth2_[]interface_{}([[one]_[[1_2]]_3]) - ns/op	379.2 ns/op	368.6 ns/op	1.03
BenchmarkFlatten/depth2_[]interface_{}([[one]_[[1_2]]_3]) - B/op	280 B/op	280 B/op	1
BenchmarkFlatten/depth2_[]interface_{}([[one]_[[1_2]]_3]) - allocs/op	10 allocs/op	10 allocs/op	1
BenchmarkFlatten/depth2_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6])	321.8 ns/op 272 B/op 8 allocs/op	324.6 ns/op 272 B/op 8 allocs/op	0.99
BenchmarkFlatten/depth2_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - ns/op	321.8 ns/op	324.6 ns/op	0.99
BenchmarkFlatten/depth2_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - B/op	272 B/op	272 B/op	1
BenchmarkFlatten/depth2_[]interface_{}([[one]_[[[1]_[2_[3]]]_[4_5]]_6]) - allocs/op	8 allocs/op	8 allocs/op	1
BenchmarkInterfaceSlice/[]int([1_2_3])	120 ns/op 72 B/op 4 allocs/op	112.6 ns/op 72 B/op 4 allocs/op	1.07
BenchmarkInterfaceSlice/[]int([1_2_3]) - ns/op	120 ns/op	112.6 ns/op	1.07
BenchmarkInterfaceSlice/[]int([1_2_3]) - B/op	72 B/op	72 B/op	1
BenchmarkInterfaceSlice/[]int([1_2_3]) - allocs/op	4 allocs/op	4 allocs/op	1
BenchmarkInterfaceSlice/[3]int([1_2_3])	63.51 ns/op 48 B/op 1 allocs/op	60.15 ns/op 48 B/op 1 allocs/op	1.06
BenchmarkInterfaceSlice/[3]int([1_2_3]) - ns/op	63.51 ns/op	60.15 ns/op	1.06
BenchmarkInterfaceSlice/[3]int([1_2_3]) - B/op	48 B/op	48 B/op	1
BenchmarkInterfaceSlice/[3]int([1_2_3]) - allocs/op	1 allocs/op	1 allocs/op	1
BenchmarkInterfaceSlice/[]string([foo_bar_baz_foo_bar_baz_foo_bar_baz_foo_bar_baz])	571.6 ns/op 384 B/op 13 allocs/op	536.3 ns/op 384 B/op 13 allocs/op	1.07
BenchmarkInterfaceSlice/[]string([foo_bar_baz_foo_bar_baz_foo_bar_baz_foo_bar_baz]) - ns/op	571.6 ns/op	536.3 ns/op	1.07
BenchmarkInterfaceSlice/[]string([foo_bar_baz_foo_bar_baz_foo_bar_baz_foo_bar_baz]) - B/op	384 B/op	384 B/op	1
BenchmarkInterfaceSlice/[]string([foo_bar_baz_foo_bar_baz_foo_bar_baz_foo_bar_baz]) - allocs/op	13 allocs/op	13 allocs/op	1
BenchmarkInterfaceSlice/[12]string([foo_bar_baz_foo_bar_baz_foo_bar_baz_foo_bar_baz])	162.9 ns/op 192 B/op 1 allocs/op	152.9 ns/op 192 B/op 1 allocs/op	1.07
BenchmarkInterfaceSlice/[12]string([foo_bar_baz_foo_bar_baz_foo_bar_baz_foo_bar_baz]) - ns/op	162.9 ns/op	152.9 ns/op	1.07
BenchmarkInterfaceSlice/[12]string([foo_bar_baz_foo_bar_baz_foo_bar_baz_foo_bar_baz]) - B/op	192 B/op	192 B/op	1
BenchmarkInterfaceSlice/[12]string([foo_bar_baz_foo_bar_baz_foo_bar_baz_foo_bar_baz]) - allocs/op	1 allocs/op	1 allocs/op	1
BenchmarkInterfaceSlice/[]interface_{}([[]_[1_2]_3])	2.169 ns/op 0 B/op 0 allocs/op	2.202 ns/op 0 B/op 0 allocs/op	0.99
BenchmarkInterfaceSlice/[]interface_{}([[]_[1_2]_3]) - ns/op	2.169 ns/op	2.202 ns/op	0.99
BenchmarkInterfaceSlice/[]interface_{}([[]_[1_2]_3]) - B/op	0 B/op	0 B/op	1
BenchmarkInterfaceSlice/[]interface_{}([[]_[1_2]_3]) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkInterfaceSlice/[3]interface_{}([[]_[1_2]_3])	67.6 ns/op 48 B/op 1 allocs/op	63.17 ns/op 48 B/op 1 allocs/op	1.07
BenchmarkInterfaceSlice/[3]interface_{}([[]_[1_2]_3]) - ns/op	67.6 ns/op	63.17 ns/op	1.07
BenchmarkInterfaceSlice/[3]interface_{}([[]_[1_2]_3]) - B/op	48 B/op	48 B/op	1
BenchmarkInterfaceSlice/[3]interface_{}([[]_[1_2]_3]) - allocs/op	1 allocs/op	1 allocs/op	1
BenchmarkToBytes	1052 ns/op 40 B/op 3 allocs/op	1125 ns/op 40 B/op 3 allocs/op	0.94
BenchmarkToBytes - ns/op	1052 ns/op	1125 ns/op	0.94
BenchmarkToBytes - B/op	40 B/op	40 B/op	1
BenchmarkToBytes - allocs/op	3 allocs/op	3 allocs/op	1
BenchmarkIsFloat/int(0)	3.1 ns/op 0 B/op 0 allocs/op	3.178 ns/op 0 B/op 0 allocs/op	0.98
BenchmarkIsFloat/int(0) - ns/op	3.1 ns/op	3.178 ns/op	0.98
BenchmarkIsFloat/int(0) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/int(0) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/int(1)	3.096 ns/op 0 B/op 0 allocs/op	3.102 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/int(1) - ns/op	3.096 ns/op	3.102 ns/op	1.00
BenchmarkIsFloat/int(1) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/int(1) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/int(-1)	3.104 ns/op 0 B/op 0 allocs/op	3.135 ns/op 0 B/op 0 allocs/op	0.99
BenchmarkIsFloat/int(-1) - ns/op	3.104 ns/op	3.135 ns/op	0.99
BenchmarkIsFloat/int(-1) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/int(-1) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/uint(42)	3.108 ns/op 0 B/op 0 allocs/op	3.097 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/uint(42) - ns/op	3.108 ns/op	3.097 ns/op	1.00
BenchmarkIsFloat/uint(42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/uint(42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/uint8(255)	3.098 ns/op 0 B/op 0 allocs/op	3.097 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/uint8(255) - ns/op	3.098 ns/op	3.097 ns/op	1.00
BenchmarkIsFloat/uint8(255) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/uint8(255) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/uint16(42)	3.099 ns/op 0 B/op 0 allocs/op	3.102 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/uint16(42) - ns/op	3.099 ns/op	3.102 ns/op	1.00
BenchmarkIsFloat/uint16(42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/uint16(42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/uint32(42)	3.097 ns/op 0 B/op 0 allocs/op	3.096 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/uint32(42) - ns/op	3.097 ns/op	3.096 ns/op	1.00
BenchmarkIsFloat/uint32(42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/uint32(42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/uint64(42)	3.098 ns/op 0 B/op 0 allocs/op	3.101 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/uint64(42) - ns/op	3.098 ns/op	3.101 ns/op	1.00
BenchmarkIsFloat/uint64(42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/uint64(42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/int(42)	3.101 ns/op 0 B/op 0 allocs/op	3.101 ns/op 0 B/op 0 allocs/op	1
BenchmarkIsFloat/int(42) - ns/op	3.101 ns/op	3.101 ns/op	1
BenchmarkIsFloat/int(42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/int(42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/int8(127)	3.098 ns/op 0 B/op 0 allocs/op	3.096 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/int8(127) - ns/op	3.098 ns/op	3.096 ns/op	1.00
BenchmarkIsFloat/int8(127) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/int8(127) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/int16(42)	3.103 ns/op 0 B/op 0 allocs/op	3.102 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/int16(42) - ns/op	3.103 ns/op	3.102 ns/op	1.00
BenchmarkIsFloat/int16(42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/int16(42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/int32(42)	3.095 ns/op 0 B/op 0 allocs/op	3.094 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/int32(42) - ns/op	3.095 ns/op	3.094 ns/op	1.00
BenchmarkIsFloat/int32(42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/int32(42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/int64(42)	3.095 ns/op 0 B/op 0 allocs/op	3.1 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/int64(42) - ns/op	3.095 ns/op	3.1 ns/op	1.00
BenchmarkIsFloat/int64(42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/int64(42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/float32(18.3)	2.786 ns/op 0 B/op 0 allocs/op	2.786 ns/op 0 B/op 0 allocs/op	1
BenchmarkIsFloat/float32(18.3) - ns/op	2.786 ns/op	2.786 ns/op	1
BenchmarkIsFloat/float32(18.3) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/float32(18.3) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/float64(18.3)	2.788 ns/op 0 B/op 0 allocs/op	2.792 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/float64(18.3) - ns/op	2.788 ns/op	2.792 ns/op	1.00
BenchmarkIsFloat/float64(18.3) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/float64(18.3) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/float64(1.5)	2.908 ns/op 0 B/op 0 allocs/op	2.786 ns/op 0 B/op 0 allocs/op	1.04
BenchmarkIsFloat/float64(1.5) - ns/op	2.908 ns/op	2.786 ns/op	1.04
BenchmarkIsFloat/float64(1.5) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/float64(1.5) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/float64(-18.6)	2.789 ns/op 0 B/op 0 allocs/op	2.789 ns/op 0 B/op 0 allocs/op	1
BenchmarkIsFloat/float64(-18.6) - ns/op	2.789 ns/op	2.789 ns/op	1
BenchmarkIsFloat/float64(-18.6) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/float64(-18.6) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/string(42)	34.75 ns/op 0 B/op 0 allocs/op	34.1 ns/op 0 B/op 0 allocs/op	1.02
BenchmarkIsFloat/string(42) - ns/op	34.75 ns/op	34.1 ns/op	1.02
BenchmarkIsFloat/string(42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/string(42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/string(052)	38.38 ns/op 0 B/op 0 allocs/op	38.08 ns/op 0 B/op 0 allocs/op	1.01
BenchmarkIsFloat/string(052) - ns/op	38.38 ns/op	38.08 ns/op	1.01
BenchmarkIsFloat/string(052) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/string(052) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/string(0xff)	74.11 ns/op 52 B/op 2 allocs/op	72.28 ns/op 52 B/op 2 allocs/op	1.03
BenchmarkIsFloat/string(0xff) - ns/op	74.11 ns/op	72.28 ns/op	1.03
BenchmarkIsFloat/string(0xff) - B/op	52 B/op	52 B/op	1
BenchmarkIsFloat/string(0xff) - allocs/op	2 allocs/op	2 allocs/op	1
BenchmarkIsFloat/string(-42)	36.96 ns/op 0 B/op 0 allocs/op	35.95 ns/op 0 B/op 0 allocs/op	1.03
BenchmarkIsFloat/string(-42) - ns/op	36.96 ns/op	35.95 ns/op	1.03
BenchmarkIsFloat/string(-42) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/string(-42) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/string(-0)	32.24 ns/op 0 B/op 0 allocs/op	32.63 ns/op 0 B/op 0 allocs/op	0.99
BenchmarkIsFloat/string(-0) - ns/op	32.24 ns/op	32.63 ns/op	0.99
BenchmarkIsFloat/string(-0) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/string(-0) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkIsFloat/string(3.14)	106.8 ns/op 56 B/op 3 allocs/op	105.3 ns/op 56 B/op 3 allocs/op	1.01
BenchmarkIsFloat/string(3.14) - ns/op	106.8 ns/op	105.3 ns/op	1.01
BenchmarkIsFloat/string(3.14) - B/op	56 B/op	56 B/op	1
BenchmarkIsFloat/string(3.14) - allocs/op	3 allocs/op	3 allocs/op	1
BenchmarkIsFloat/string(-3.14)	122 ns/op 64 B/op 3 allocs/op	112.2 ns/op 64 B/op 3 allocs/op	1.09
BenchmarkIsFloat/string(-3.14) - ns/op	122 ns/op	112.2 ns/op	1.09
BenchmarkIsFloat/string(-3.14) - B/op	64 B/op	64 B/op	1
BenchmarkIsFloat/string(-3.14) - allocs/op	3 allocs/op	3 allocs/op	1
BenchmarkIsFloat/string(0.00)	104.4 ns/op 56 B/op 3 allocs/op	105.8 ns/op 56 B/op 3 allocs/op	0.99
BenchmarkIsFloat/string(0.00) - ns/op	104.4 ns/op	105.8 ns/op	0.99
BenchmarkIsFloat/string(0.00) - B/op	56 B/op	56 B/op	1
BenchmarkIsFloat/string(0.00) - allocs/op	3 allocs/op	3 allocs/op	1
BenchmarkIsFloat/string(NaN)	94.54 ns/op 54 B/op 3 allocs/op	93.86 ns/op 54 B/op 3 allocs/op	1.01
BenchmarkIsFloat/string(NaN) - ns/op	94.54 ns/op	93.86 ns/op	1.01
BenchmarkIsFloat/string(NaN) - B/op	54 B/op	54 B/op	1
BenchmarkIsFloat/string(NaN) - allocs/op	3 allocs/op	3 allocs/op	1
BenchmarkIsFloat/string(-Inf)	97.26 ns/op 56 B/op 3 allocs/op	92.49 ns/op 56 B/op 3 allocs/op	1.05
BenchmarkIsFloat/string(-Inf) - ns/op	97.26 ns/op	92.49 ns/op	1.05
BenchmarkIsFloat/string(-Inf) - B/op	56 B/op	56 B/op	1
BenchmarkIsFloat/string(-Inf) - allocs/op	3 allocs/op	3 allocs/op	1
BenchmarkIsFloat/string(+Inf)	97.6 ns/op 56 B/op 3 allocs/op	93.17 ns/op 56 B/op 3 allocs/op	1.05
BenchmarkIsFloat/string(+Inf) - ns/op	97.6 ns/op	93.17 ns/op	1.05
BenchmarkIsFloat/string(+Inf) - B/op	56 B/op	56 B/op	1
BenchmarkIsFloat/string(+Inf) - allocs/op	3 allocs/op	3 allocs/op	1
BenchmarkIsFloat/string()	50.75 ns/op 48 B/op 1 allocs/op	49.84 ns/op 48 B/op 1 allocs/op	1.02
BenchmarkIsFloat/string() - ns/op	50.75 ns/op	49.84 ns/op	1.02
BenchmarkIsFloat/string() - B/op	48 B/op	48 B/op	1
BenchmarkIsFloat/string() - allocs/op	1 allocs/op	1 allocs/op	1
BenchmarkIsFloat/string(foo)	72.11 ns/op 51 B/op 2 allocs/op	69.53 ns/op 51 B/op 2 allocs/op	1.04
BenchmarkIsFloat/string(foo) - ns/op	72.11 ns/op	69.53 ns/op	1.04
BenchmarkIsFloat/string(foo) - B/op	51 B/op	51 B/op	1
BenchmarkIsFloat/string(foo) - allocs/op	2 allocs/op	2 allocs/op	1
BenchmarkIsFloat/bool(true)	3.095 ns/op 0 B/op 0 allocs/op	3.097 ns/op 0 B/op 0 allocs/op	1.00
BenchmarkIsFloat/bool(true) - ns/op	3.095 ns/op	3.097 ns/op	1.00
BenchmarkIsFloat/bool(true) - B/op	0 B/op	0 B/op	1
BenchmarkIsFloat/bool(true) - allocs/op	0 allocs/op	0 allocs/op	1
BenchmarkLookupIPs	51824 ns/op 1872 B/op 46 allocs/op	50737 ns/op 1840 B/op 44 allocs/op	1.02
BenchmarkLookupIPs - ns/op	51824 ns/op	50737 ns/op	1.02
BenchmarkLookupIPs - B/op	1872 B/op	1840 B/op	1.02
BenchmarkLookupIPs - allocs/op	46 allocs/op	44 allocs/op	1.05
BenchmarkIndent	1839 ns/op 2040 B/op 18 allocs/op	1946 ns/op 2064 B/op 20 allocs/op	0.95
BenchmarkIndent - ns/op	1839 ns/op	1946 ns/op	0.95
BenchmarkIndent - B/op	2040 B/op	2064 B/op	0.99
BenchmarkIndent - allocs/op	18 allocs/op	20 allocs/op	0.90

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