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diff --git a/deps/icu-small/source/i18n/number_mapper.h b/deps/icu-small/source/i18n/number_mapper.h
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+++ b/deps/icu-small/source/i18n/number_mapper.h
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+// © 2018 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+#ifndef __NUMBER_MAPPER_H__
+#define __NUMBER_MAPPER_H__
+
+#include <atomic>
+#include "number_types.h"
+#include "unicode/currpinf.h"
+#include "standardplural.h"
+#include "number_patternstring.h"
+#include "number_currencysymbols.h"
+#include "numparse_impl.h"
+
+U_NAMESPACE_BEGIN
+namespace number {
+namespace impl {
+
+
+class PropertiesAffixPatternProvider : public AffixPatternProvider, public UMemory {
+  public:
+    bool isBogus() const {
+        return fBogus;
+    }
+
+    void setToBogus() {
+        fBogus = true;
+    }
+
+    void setTo(const DecimalFormatProperties& properties, UErrorCode& status);
+
+    PropertiesAffixPatternProvider() = default; // puts instance in valid but undefined state
+
+    PropertiesAffixPatternProvider(const DecimalFormatProperties& properties, UErrorCode& status) {
+        setTo(properties, status);
+    }
+
+    // AffixPatternProvider Methods:
+
+    char16_t charAt(int32_t flags, int32_t i) const U_OVERRIDE;
+
+    int32_t length(int32_t flags) const U_OVERRIDE;
+
+    UnicodeString getString(int32_t flags) const U_OVERRIDE;
+
+    bool hasCurrencySign() const U_OVERRIDE;
+
+    bool positiveHasPlusSign() const U_OVERRIDE;
+
+    bool hasNegativeSubpattern() const U_OVERRIDE;
+
+    bool negativeHasMinusSign() const U_OVERRIDE;
+
+    bool containsSymbolType(AffixPatternType, UErrorCode&) const U_OVERRIDE;
+
+    bool hasBody() const U_OVERRIDE;
+
+  private:
+    UnicodeString posPrefix;
+    UnicodeString posSuffix;
+    UnicodeString negPrefix;
+    UnicodeString negSuffix;
+
+    const UnicodeString& getStringInternal(int32_t flags) const;
+
+    bool fBogus{true};
+};
+
+
+class CurrencyPluralInfoAffixProvider : public AffixPatternProvider, public UMemory {
+  public:
+    bool isBogus() const {
+        return fBogus;
+    }
+
+    void setToBogus() {
+        fBogus = true;
+    }
+
+    void setTo(const CurrencyPluralInfo& cpi, const DecimalFormatProperties& properties,
+               UErrorCode& status);
+
+    // AffixPatternProvider Methods:
+
+    char16_t charAt(int32_t flags, int32_t i) const U_OVERRIDE;
+
+    int32_t length(int32_t flags) const U_OVERRIDE;
+
+    UnicodeString getString(int32_t flags) const U_OVERRIDE;
+
+    bool hasCurrencySign() const U_OVERRIDE;
+
+    bool positiveHasPlusSign() const U_OVERRIDE;
+
+    bool hasNegativeSubpattern() const U_OVERRIDE;
+
+    bool negativeHasMinusSign() const U_OVERRIDE;
+
+    bool containsSymbolType(AffixPatternType, UErrorCode&) const U_OVERRIDE;
+
+    bool hasBody() const U_OVERRIDE;
+
+  private:
+    PropertiesAffixPatternProvider affixesByPlural[StandardPlural::COUNT];
+
+    bool fBogus{true};
+};
+
+
+/**
+ * A struct for ownership of a few objects needed for formatting.
+ */
+struct DecimalFormatWarehouse {
+    PropertiesAffixPatternProvider propertiesAPP;
+    CurrencyPluralInfoAffixProvider currencyPluralInfoAPP;
+    CurrencySymbols currencySymbols;
+};
+
+
+/**
+* Internal fields for DecimalFormat.
+* TODO: Make some of these fields by value instead of by LocalPointer?
+*/
+struct DecimalFormatFields : public UMemory {
+    /** The property bag corresponding to user-specified settings and settings from the pattern string. */
+    LocalPointer<DecimalFormatProperties> properties;
+
+    /** The symbols for the current locale. */
+    LocalPointer<const DecimalFormatSymbols> symbols;
+
+    /**
+    * The pre-computed formatter object. Setters cause this to be re-computed atomically. The {@link
+    * #format} method uses the formatter directly without needing to synchronize.
+    */
+    LocalPointer<const LocalizedNumberFormatter> formatter;
+
+    /** The lazy-computed parser for .parse() */
+    std::atomic<::icu::numparse::impl::NumberParserImpl*> atomicParser = {};
+
+    /** The lazy-computed parser for .parseCurrency() */
+    std::atomic<::icu::numparse::impl::NumberParserImpl*> atomicCurrencyParser = {};
+
+    /** Small object ownership warehouse for the formatter and parser */
+    DecimalFormatWarehouse warehouse;
+
+    /** The effective properties as exported from the formatter object. Used by some getters. */
+    LocalPointer<DecimalFormatProperties> exportedProperties;
+
+    // Data for fastpath
+    bool canUseFastFormat = false;
+    struct FastFormatData {
+        char16_t cpZero;
+        char16_t cpGroupingSeparator;
+        char16_t cpMinusSign;
+        int8_t minInt;
+        int8_t maxInt;
+    } fastData;
+};
+
+
+/**
+ * Utilities for converting between a DecimalFormatProperties and a MacroProps.
+ */
+class NumberPropertyMapper {
+  public:
+    /** Convenience method to create a NumberFormatter directly from Properties. */
+    static UnlocalizedNumberFormatter create(const DecimalFormatProperties& properties,
+                                             const DecimalFormatSymbols& symbols,
+                                             DecimalFormatWarehouse& warehouse, UErrorCode& status);
+
+    /** Convenience method to create a NumberFormatter directly from Properties. */
+    static UnlocalizedNumberFormatter create(const DecimalFormatProperties& properties,
+                                             const DecimalFormatSymbols& symbols,
+                                             DecimalFormatWarehouse& warehouse,
+                                             DecimalFormatProperties& exportedProperties,
+                                             UErrorCode& status);
+
+    /**
+     * Creates a new {@link MacroProps} object based on the content of a {@link DecimalFormatProperties}
+     * object. In other words, maps Properties to MacroProps. This function is used by the
+     * JDK-compatibility API to call into the ICU 60 fluent number formatting pipeline.
+     *
+     * @param properties
+     *            The property bag to be mapped.
+     * @param symbols
+     *            The symbols associated with the property bag.
+     * @param exportedProperties
+     *            A property bag in which to store validated properties. Used by some DecimalFormat
+     *            getters.
+     * @return A new MacroProps containing all of the information in the Properties.
+     */
+    static MacroProps oldToNew(const DecimalFormatProperties& properties,
+                               const DecimalFormatSymbols& symbols, DecimalFormatWarehouse& warehouse,
+                               DecimalFormatProperties* exportedProperties, UErrorCode& status);
+};
+
+
+} // namespace impl
+} // namespace numparse
+U_NAMESPACE_END
+
+#endif //__NUMBER_MAPPER_H__
+#endif /* #if !UCONFIG_NO_FORMATTING */