StarterKit binder

General style: skill aspid-code-style; placement: starterkit-layout; docs: asp-xmldoc. This skill covers only what is specific to binders.

Binder review (standing routine for any binder the user sends)

1. Briefly: what the binder is for.
2. Bugs and shortcomings, including missing IBinder<T> implementations (a value binder may accept one more type).
3. // comments: delete the unnecessary ones entirely, shorten the rest.
4. [Tooltip]: short, on all serialized fields without exception.
5. XML docs: <remarks> only where it is needed.

Apply the fixes immediately; do not end with "shall I apply?".

A family for a component property

For Component.property there are usually four Mono classes in one subfolder (Binders/<Component>/<Property>/):

Plus XxxToSourceMonoBinder (ComponentToSourceMonoBinder) at the root of the component folder when the property is read back into the ViewModel.

• A UnityEngine.Object value (Material, AudioClip, Mesh, Sprite) → ComponentObjectMonoBinder, not ComponentMonoBinder<T, Material>: the generator then gives the serializable twin a TargetObjectBinder.
• float/int → ComponentFloatMonoBinder/ComponentIntMonoBinder: they provide INumberBinder and the whole numeric family. A shared base must never narrow the interfaces of its subclasses.
• A Switcher accepts bool only: do not derive it from TargetBinder<TTarget, T> and do not add IBinder<T>. Reuse the selection logic through a closed [SerializeField] BoolToValueConverter<T>.
• Add IColorBinder, IVectorBinder, IRotationBinder (General/Color, General/Vector, General/Rotation) to color/vector/rotation binders so they accept strings, Color32, Vector2/3/4, Quaternion/Euler.

Skeleton

using UnityEngine;

// ReSharper disable once CheckNamespace
namespace Aspid.MVVM.StarterKit
{
    /// <summary>
    /// <see cref="ComponentFloatMonoBinder{TComponent}"/> that binds <see cref="AudioSource.volume"/>.
    /// </summary>
    /// <remarks>
    /// The value is clamped to 0..1.
    /// </remarks>
    [GenerateSerializableBinder]
    [AddBinderContextMenu(typeof(AudioSource), serializePropertyNames: "m_Volume")]
    [AddComponentMenu("Aspid/MVVM/Binders/Audio/AudioSource/AudioSource Binder – Volume")]
    public class AudioSourceVolumeMonoBinder : ComponentFloatMonoBinder<AudioSource>
    {
        /// <inheritdoc/>
        protected sealed override float Property
        {
            get => CachedComponent.volume;
            set => CachedComponent.volume = this.SafeClamp01(value);
        }
    }
}

• A MonoBehaviour file has no #nullable enable and no ? annotations.
• Attribute order: GenerateSerializableBinder → AddBinderContextMenu → AddComponentMenu. Switcher/Enum/EnumGroup variants are not generated and set SubPath = "Switcher"|"Enum"|"EnumGroup" in AddBinderContextMenu instead.
• serializePropertyNames lists Unity's serialized property names (m_Volume, m_Color, m_Sprite) so the context menu appears on the right Inspector field.
• AddComponentMenu: Aspid/MVVM/Binders/<Area>/<Component>/<Component> Binder – <Property>[ <Variant>]. One path per component (Audio/AudioSource/ for all of them, including IsPlaying/PlayOneShot).
• A class with [GenerateSerializableBinder] is not sealed and needs no partial; a non-generated class that is not a base is sealed.
• A concrete binder overrides only Property (or SetValue); checks and logging live inside the setter.

Values and errors

• Validation is never silent: BinderMath.SafeClamp/SafeClamp01/NonNegative/RequireFinite log through BinderLogger and substitute the nearest valid value. No quiet if (!IsFinite(value)) return;.
• A helper that sanitizes a value takes the caller (this IBinder or Type binderType) instead of being a free static.
• A field with [Range(0, 1)] in the Inspector gets no duplicate runtime clamp for the same condition.
• null from the ViewModel means reset the state (clear the list, default, hide), not an early return. An early return is acceptable only when there is nothing to reset, and <remarks> says why.
• A value outside the target type's range saturates (NumericSaturation); the reverse channel (*ToSource) raises all numeric events the same way.
• Errors are logged on every occurrence, without "already logged" flags. Error texts: one or two short phrases.
• Switcher variants clamp in SetValue, not in GetConvertedValue.

Converter inside a binder

• The slot is [SerializeReference] private IConverter<TFrom, TTo> _converter; without [TypeSelector] (StarterKitTypePickerDrawer supplies the picker). A required slot: LogError and skip when empty; default through CreateDefaultConverter() in Reset/OnValidate (see CasterMonoBinder).
• The type of a serialized factory or converter is not lifted into a class generic parameter: the field is typed by the interface directly (IViewFactory<TView>).
• Casters derive from CasterMonoBinder<TFrom, TTo>; AnyToStringCasterMonoBinder stays separate (generic SetValue<T> from IAnyBinder).

Serializable (non-Mono) binders

• Generated from the Mono class via [GenerateSerializableBinder]; only bases (Binder, TargetBinder, SwitcherBinder, DelegateXxxBinder) and binders without a Mono twin are written by hand.
• A hand-written serializable binder: [Serializable], a protected constructor for deserialization, multi-parameter constructors one parameter per line, Object parameters rather than GameObject, CanBind on an empty reference in the Mono version.
• Collection bases handle a multi-element Replace with a loop, not NotImplementedException; replacing a ViewModel = release + create, Deinitialize before Release.

Serialized fields

• [Tooltip] on every one, short; the caveat is repeated in the <param> of the serializable twin's constructor.
• [Min]/[Range] wherever the value can become invalid; consistent with the constructor exception and the Tooltip.
• A field used only in some bind modes: [UsedInModes(BindMode.…)].
• No = default!, no [FormerlySerializedAs].

Documentation

• Docs/docs/StarterKit/README.md and the family's *-binders.md (with the ru twins in Docs/i18n/ru/docusaurus-plugin-content-docs/current/StarterKit/): one row per binder, the modes column includes OneWayToSource, a ranges/clamps table where applicable.
• The binder <summary> is one line: <see cref="Base{T}"/> that binds <see cref="Component.property"/>.; cref generic bases by their parameter names, never {Graphic, Color}.