The image crate with default options is the absolute leader in code size:

 File  .text     Size Crate
 5.7%  14.6% 364.0KiB image
 4.6%  12.0% 297.3KiB wgpu_native
 3.8%   9.9% 246.5KiB std
 3.5%   8.9% 222.1KiB usvg
 2.6%   6.8% 170.0KiB iced_wgpu

I don't need to support ico, bmp, tga, hdr, dxt, dds, farbfeld and so on in a program that would only ever decode

建议使用ConcurrentHashMap
eg:private final Map<Class, ObjectParamMetadata> classToMetadata = new ConcurrentHashMap, ObjectParamMetadata>();

此处s是否可