Have you ever analyzed the released Volt binary? It has symbols like this:
000000010001dc30 g 0f SECT 01 0000 [.text] _f_1
000000010001eba0 g 0f SECT 01 0000 [.text] _f_10
00000001000219a0 g 0f SECT 01 0000 [.text] _f_100
[...snip...]
000000010004bae0 g 0f SECT 01 0000 [.text] _f_462
000000010002a430 g 0f SECT 01 0000 [.text] _f_463
0000000100037940 g 0f SECT 01 0000 [.text] _f_464
000000010001f2f0 g 0f SECT 01 0000 [.text] _f_465
0000000100020220 g 0f SECT 01 0000 [.text] _f_47
0000000100020240 g 0f SECT 01 0000 [.text] _f_48
00000001000202b0 g 0f SECT 01 0000 [.text] _f_49
[...snip...]
00000001000182a0 g 0f SECT 01 0000 [.text] _string_add
000000010001a110 g 0f SECT 01 0000 [.text] _string_all_after
000000010001a020 g 0f SECT 01 0000 [.text] _string_all_before
000000010001a090 g 0f SECT 01 0000 [.text] _string_all_before_last
0000000100019ef0 g 0f SECT 01 0000 [.text] _string_at
0000000100018540 g 0f SECT 01 0000 [.text] _string_clone
0000000100018aa0 g 0f SECT 01 0000 [.text] _string_contains
0000000100018610 g 0f SECT 01 0000 [.text] _string_cstr
0000000100019470 g 0f SECT 01 0000 [.text] _string_ends_with
0000000100018b30 g 0f SECT 01 0000 [.text] _string_eq
While you can always mangle symbols, it is strange that i) every symbol is in public and ii) only some of them are mangled. Therefore I think the binary was probably produced by V's C transpiler, with some V standard library functions slapped on them.
(I had to rewrite the reply because I later realized that the binary was packed with UPX, I should have thoroughly inspected strings. Sorry for inconvenience.)