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acbb8d4fb5
Use an enum for the method arg instead of needing to add an id
that doesn't map to an actual method name.
$ ruby --dump=insns -e 'b = "x"; [v].pack("E*", buffer: b)'
before:
```
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,34)>
local table (size: 1, argc: 0 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
[ 1] b@0
0000 putchilledstring "x" ( 1)[Li]
0002 setlocal_WC_0 b@0
0004 putself
0005 opt_send_without_block <calldata!mid:v, argc:0, FCALL|VCALL|ARGS_SIMPLE>
0007 newarray 1
0009 putchilledstring "E*"
0011 getlocal_WC_0 b@0
0013 opt_send_without_block <calldata!mid:pack, argc:2, kw:[#<Symbol:0x000000000023110c>], KWARG>
0015 leave
```
after:
```
== disasm: #<ISeq:<main>@-e:1 (1,0)-(1,34)>
local table (size: 1, argc: 0 [opts: 0, rest: -1, post: 0, block: -1, kw: -1@-1, kwrest: -1])
[ 1] b@0
0000 putchilledstring "x" ( 1)[Li]
0002 setlocal_WC_0 b@0
0004 putself
0005 opt_send_without_block <calldata!mid:v, argc:0, FCALL|VCALL|ARGS_SIMPLE>
0007 putchilledstring "E*"
0009 getlocal b@0, 0
0012 opt_newarray_send 3, 5
0015 leave
```