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diff --git a/deps/icu-small/source/i18n/number_utypes.h b/deps/icu-small/source/i18n/number_utypes.h
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+++ b/deps/icu-small/source/i18n/number_utypes.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 __SOURCE_NUMBER_UTYPES_H__
+#define __SOURCE_NUMBER_UTYPES_H__
+
+#include "unicode/numberformatter.h"
+#include "number_types.h"
+#include "number_decimalquantity.h"
+#include "number_stringbuilder.h"
+
+U_NAMESPACE_BEGIN namespace number {
+namespace impl {
+
+
+/**
+ * Implementation class for UNumberFormatter with a magic number for safety.
+ *
+ * Wraps a LocalizedNumberFormatter by value.
+ */
+struct UNumberFormatterData : public UMemory {
+    // The magic number to identify incoming objects.
+    // Reads in ASCII as "NFR" (NumberFormatteR with room at the end)
+    static constexpr int32_t kMagic = 0x4E465200;
+
+    // Data members:
+    int32_t fMagic = kMagic;
+    LocalizedNumberFormatter fFormatter;
+
+    /** Convert from UNumberFormatter -> UNumberFormatterData. */
+    static UNumberFormatterData* validate(UNumberFormatter* input, UErrorCode& status);
+
+    /** Convert from UNumberFormatter -> UNumberFormatterData (const version). */
+    static const UNumberFormatterData* validate(const UNumberFormatter* input, UErrorCode& status);
+
+    /** Convert from UNumberFormatterData -> UNumberFormatter. */
+    UNumberFormatter* exportForC();
+};
+
+
+/**
+ * Implementation class for UFormattedNumber with magic number for safety.
+ *
+ * This struct is also held internally by the C++ version FormattedNumber since the member types are not
+ * declared in the public header file.
+ *
+ * The DecimalQuantity is not currently being used by FormattedNumber, but at some point it could be used
+ * to add a toDecNumber() or similar method.
+ */
+struct UFormattedNumberData : public UMemory {
+    // The magic number to identify incoming objects.
+    // Reads in ASCII as "FDN" (FormatteDNumber with room at the end)
+    static constexpr int32_t kMagic = 0x46444E00;
+
+    // Data members:
+    int32_t fMagic = kMagic;
+    DecimalQuantity quantity;
+    NumberStringBuilder string;
+
+    /** Convert from UFormattedNumber -> UFormattedNumberData. */
+    static UFormattedNumberData* validate(UFormattedNumber* input, UErrorCode& status);
+
+    /** Convert from UFormattedNumber -> UFormattedNumberData (const version). */
+    static const UFormattedNumberData* validate(const UFormattedNumber* input, UErrorCode& status);
+
+    /** Convert from UFormattedNumberData -> UFormattedNumber. */
+    UFormattedNumber* exportForC();
+};
+
+
+} // namespace impl
+} // namespace number
+U_NAMESPACE_END
+
+#endif //__SOURCE_NUMBER_UTYPES_H__
+#endif /* #if !UCONFIG_NO_FORMATTING */