Add baby CAS unit conversion

intl.emu

@@ -50,80 +50,6 @@
         1. Return FormatNumeric(_numberFormat_, _numValue_).
       </emu-alg>
     </emu-clause>
-
-    <emu-clause id="sup-amount.prototype.convertto">
-      <h1>Amount.prototype.convertTo ( _options_ )</h1>
-
-      <p>This definition supersedes the definition provided in es2025, <emu-xref href="#sec-amount.prototype.convertto"></emu-xref>.</p>
-
-      <p>This function performs the following steps when called:</p>
-
-      <emu-alg>
-        1. Let _O_ be the *this* value.
-        1. Perform ? RequireInternalSlot(_O_, [[AmountValue]]).
-        1. Let _sourceUnit_ be _O_.[[Unit]].
-        1. If _sourceUnit_ is *undefined*, throw a *TypeError* exception.
-        1. Let _validatedOpts_ be ? GetAmountConvertToOptions(_options_).
-        1. Let _targetUnit_ be _validatedOpts_.[[Unit]].
-        1. Let _roundingMode_ be _validatedOpts_.[[RoundingMode]].
-        1. Let _roundingPriority_ be _validatedOpts_.[[RoundingPriority]].
-        1. Let _minFractionDigits_ be _validatedOpts_.[[MiniumumFractionDigits]].
-        1. Let _maxFractionDigits_ be _validatedOpts_.[[MaximumFractionDigits]].
-        1. Let _minSignificantDigits_ be _validatedOpts_.[[MinimumSignificantDigits]].
-        1. Let _maxSignificantDigits_ be _validatedOpts_.[[MaximumSignificantDigits]].
-        1. Let _locale_ be _validatedOpts_.[[Locale]].
-        1. Let _usage_ be _validatedOpts_.[[Usage]].
-        1. If _targetUnit_ is *undefined* and _locale_ is *undefined* and _usage_ is *undefined*, throw a *TypeError* exception.
-        1. Let _v_ be _O_.[[AmountValue]].
-        1. If _v_ is a Number, then
-          1. Let _sourceValue_ be _v_.
-        1. Else if _v_ is a BigInt, then
-          1. Let _sourceValue_ be 𝔽(ℝ(_v_)).
-        1. Else,
-          1. Assert: _v_ is a String.
-          1. Let _sourceValue_ be StringToNumber(_v_).
-        1. If _targetUnit_ is not *undefined*, then
-          1. If _locale_ is not *undefined* or _usage_ is not *undefined*, throw a *TypeError* exception.
-        1. Else,
-          1. Let _matcher_ be ? GetOption(_validatedOpts_, *"localeMatcher"*, ~string~, « *"lookup"*, *"best fit"* », *"best fit"*).
-          1. Let _requestedLocales_ be ? CanonicalizeLocaleList(_locale_).
-          1. If _usage_ is *undefined*, set _usage_ to *"default"*.
-          1. Set _targetUnit_ to ? ResolveUnitPreference(_sourceUnit_, _sourceValue_, _requestedLocales_, _usage_, _matcher_).
-        1. Let _convertedValue_ be ? ConvertUnitValue(_sourceValue_, _sourceUnit_, _targetUnit_).
-        1. Let _result_ be OrdinaryObjectCreate(%Amount.prototype%, « [[AmountValue]], [[Unit]] »).
-        1. TODO Let _intlObject_ be an Object suitable for use as the first argument of a call to <emu-xref href="#sec-formatnumerictostring">FormatNumericToString</emu-xref> that uses _minSignificantDigits_, _maxSignificantDigits_, _minFractionDigits_, _maxFractionDigits_, _roundingPriority_, and _roundingMode_.
-        1. Let _formatted_ be FormatNumericToString(_intlObject_, _convertedValue_, 0).
-        1. Set _result_.[[AmountValue]] to _formatted_.[[FormattedString]].
-        1. Set _result_.[[Unit]] to _targetUnit_.
-        1. Return _result_.
-      </emu-alg>
-    </emu-clause>
-
-    <emu-clause id="sec-resolveunitpreference" type="implementation-defined abstract operation">
-      <h1>ResolveUnitPreference (
-        _sourceUnit_: a String,
-        _sourceValue_: a Number,
-        _requestedLocales_: a Language Priority List,
-        _usage_: a String,
-        _localeMatcher_: a String,
-      ): either a normal completion containing a String or a throw completion
-      </h1>
-      <dl class="header">
-        <dt>description</dt>
-        <dd>It determines the preferred target unit for _sourceUnit_ in the locale best matching _requestedLocales_ and _usage_ context, based on CLDR unit preferences data.</dd>
-      </dl>
-      <emu-alg>
-        1. Let _sourceConv_ be ? GetUnitConversionFactor(_sourceUnit_).
-        1. Let _category_ be _sourceConv_.[[Category]].
-        1. Let _availableLocales_ be the Available Locales List for locales for which the <code>&lt;unitPreferences></code> element data of <a href="https://unicode.org/reports/tr35/tr35-info.html#Unit_Preferences">UTS #35 Part 6 Supplemental, Unit Preferences</a> includes data.
-        1. Let _localeData_ be a Record whose field names are the elements of _availableLocales_ and whose values are Records.
-        1. Let _r_ be ResolveLocale(_availableLocales_, _requestedLocales_, the Record { [[localeMatcher]]: _localeMatcher_ }, « », _localeData_).
-        1. Let _locale_ be _r_.[[Locale]].
-        1. Let _preferredUnit_ be the preferred unit for _category_, _locale_, _usage_, and _sourceValue_ as specified by the <code>&lt;unitPreferences></code> element data of <a href="https://unicode.org/reports/tr35/tr35-info.html#Unit_Preferences">UTS #35 Part 6 Supplemental, Unit Preferences</a>.
-        1. If _preferredUnit_ is *undefined*, throw a *RangeError* exception.
-        1. Return _preferredUnit_.
-      </emu-alg>
-    </emu-clause>
   </emu-clause>
 
   <emu-clause id="sec-amount-intl-normative-references">