[encoding.binary] error decoding map[K]Struct

[kravlad]

Describe the bug

Now V panics if I try to call binary.decode_binary with a map that has a struct as a value. (For example map[string]Struct)

Reproduction Steps

module main
import encoding.binary

struct St {
	i int
}

fn main() {
	b := binary.encode_binary({"s": St{1}})!
	b2 := binary.decode_binary[map[string]St](b)!
	println('Decoded binary file: ${b2}')
}

Expected Behavior

"Decoded binary file: {'s': St{
    i: 1
}}"

Current Behavior

/Users/user/dev/v/vlib/encoding/binary/serialize.v:402:8: error: cannot assign to `v`: expected `binary.Any`, not `St`
  400 |             v = decode_string(mut s)!
  401 |         } $else $if V is $struct {
  402 |             v = decode_struct(mut s, V{})!
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~
  403 |         } $else $if V is $map {
  404 |             v = decode_map(mut s, V{})!
/Users/user/dev/v/vlib/encoding/binary/serialize.v:408:17: error: cannot cast `encoding.binary.Any` to `St`
  406 |             v = decode_primitive(mut s, unsafe { V(0) })!
  407 |         }
  408 |         m[k as K] = v as V
      |                       ~~
  409 |     }
  410 |     return m

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.10 d54a823

Environment details (OS name and version, etc.)

|V full version      |V 0.4.10 b114254.d54a823
|:-------------------|:-------------------
|OS                  |macos, macOS, 15.3.2, 24D81
|Processor           |8 cpus, 64bit, little endian, Apple M1
|Memory              |0.18GB/16GB
|                    |
|V executable        |/Users/user/dev/v/v
|V last modified time|2025-04-11 03:43:02
|                    |
|V home dir          |OK, value: /Users/user/dev/v
|VMODULES            |OK, value: /Users/user/.vmodules
|VTMP                |OK, value: /tmp/v_501
|Current working dir |OK, value: /Users/user/projects/proj
|                    |
|Git version         |git version 2.49.0
|V git status        |weekly.2024.41-1243-gd54a8232 (2 commit(s) behind V master)
|.git/config present |true
|                    |
|cc version          |Apple clang version 16.0.0 (clang-1600.0.26.6)
|gcc version         |Apple clang version 16.0.0 (clang-1600.0.26.6)
|clang version       |Apple clang version 16.0.0 (clang-1600.0.26.6)
|tcc version         |tcc version 0.9.28rc 2024-02-05 HEAD@105d70f7 (AArch64 Darwin)
|tcc git status      |thirdparty-macos-arm64 713692d4
|emcc version        |N/A
|glibc version       |N/A

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[spytheman]

Those messages are errors, not a panic.